254:(Pb): In the mid-1970s, lead was listed as a criteria air pollutant that required NAAQS regulation. In 1977, the EPA published a document which detailed the Air Quality Criteria for lead. This document was based on the scientific assessments of lead at the time. Based on this report (1977 Lead AQCD), the EPA established a "1.5 μg/m (maximum quarterly calendar average) Pb NAAQS in 1978." The Clean Air Act requires periodic review of NAAQS, and new scientific data published after 1977 made it necessary to revise the standards previously established in the 1977 Lead AQCD document. An Addendum to the document was published in 1986 and then again as a Supplement to the 1986 AQCD/Addendum in 1990. In 1990, a Lead Staff Paper was prepared by the EPA's Office of Air Quality Planning and Standards (OPQPS), which was based on information presented in the 1986 Lead/AQCD/Addendum and 1990 Supplement, in addition to other OAQPS sponsored lead exposure/risk analyses. In this paper, it was proposed that the Pb NAAQS be revised further and presented options for revision to the EPA. The EPA elected to not modify the Pb NAAQS further, but decided to instead focus on the 1991 U.S. EPA Strategy for Reducing Lead Exposure. The EPA concentrated on regulatory and remedial clean-up efforts to minimize Pb exposure from numerous non-air sources that caused more severe public health risks, and undertook actions to reduce air emissions.
260:(CO): The EPA set the first NAAQS for carbon monoxide in 1971. The primary standard was set at 9 ppm averaged over an 8-hour period and 35 ppm over a 1-hour period. The majority of CO emitted into the ambient air is from mobile sources. The EPA has reviewed and assessed the current scientific literature with respect to CO in 1979, 1984, 1991, and 1994. After the review in 1984 the EPA decided to remove the secondary standard for CO due to lack of significant evidence of the adverse environmental impacts. On January 28, 2011, the EPA decided that the current NAAQS for CO were sufficient and proposed to keep the existing standards as they stood. The EPA is strengthening monitoring requirements for CO by calling for CO monitors to be placed in strategic locations near large urban areas. Specifically, the EPA has called for monitors to be placed and operational in CBSA's (core based statistical areas) with populations over 2.5 million by January 1, 2015; and in CBSA's with populations of 1 million or more by January 1, 2017. In addition they are requiring the collocation of CO monitors with NO
1444:
223:): Ozone found on the surface-level, also known as tropospheric ozone is also regulated by the NAAQS under the Clean Air Act. Ozone was originally found to be damaging to grapes in the 1950s. The US EPA set "oxidants" standards in 1971, which included ozone. These standards were created to reduce agricultural impacts and other related damages. Like lead, ozone requires a reexamination of new findings of health and vegetation effects periodically. This aspect necessitated the creation of a US EPA criteria document. Further analysis done in 1979 and 1997 made it necessary to significantly modify the pollution standards.
31:
246:, fine particles: 2.5 μm in size or less. Particulate Matter (PM) was listed in the 1996 Criteria document issued by the EPA. In April 2001, the EPA created a Second External Review Draft of the Air Quality Criteria for PM, which addressed updated studies done on particulate matter and the modified pollutant standards done since the First External Review Draft. In May 2002, a Third External Review Draft was made, and the EPA revised PM requirements again. After issuing a fourth version of the document, the EPA issued the final version in October 2004.
389:. Primary standards are designed to protect human health, with an adequate margin of safety, including sensitive populations such as children, the elderly, and individuals suffering from respiratory diseases. Secondary standards are designed to protect public welfare, damage to property, transportation hazards, economic values, and personal comfort and well-being from any known or anticipated adverse effects of a pollutant. A district meeting a given standard is known as an "attainment area" for that standard, and otherwise a "non-attainment area".
207:
them that assess the latest available scientific information on nature and effects of ambient exposure to them; (3) to set primary NAAQS to protect human health with adequate margin of safety and to set secondary NAAQS to protect against welfare effects (e.g., effects on vegetation, ecosystems, visibility, climate, manmade materials, etc); and (5) to periodically review and revise, as appropriate, the criteria and NAAQS for a given listed pollutant or class of pollutants."
4912:
345:
pollutants. Also, in 2010, the EPA decided to ensure compliance by strengthening monitoring requirements, calling for increased numbers of monitoring systems near large urban areas and major roadways. On March 20, 2012, the EPA "took final action" to maintain the existing NAAQS as they stand. The national average of NO
264:
monitors in urban areas having a population of 1 million for more. As of May 2011 there were approximately 328 operational CO monitors in place nationwide. The EPA has provided some authority to the EPA Regional
Administrators to oversee case-by-case requested exceptions and in determining the need
287:
family. The EPA first set primary and secondary standards in 1971. Dual primary standards were set at 140 ppb averaged over a 24-hour period, and at 30 ppb averaged annually. The secondary standard was set at 500 ppb averaged over a 3-hour period, not to be exceeded more than once a
206:
The EPA established the NAAQS according to
Sections 108 and 109 of the U.S. Clean Air Act, which was last amended in 1990. These sections require the EPA "(1) to list widespread air pollutants that reasonably may be expected to endanger public health or welfare; (2) to issue air quality criteria for
202:
as needing standards on a national level. The Clean Air Act requires the EPA to set US National
Ambient Air Quality Standards (NAAQS) for the six CAPs. The NAAQS are health based and the EPA sets two types of standards: primary and secondary. The primary standards are designed to protect the health
292:
affecting sensitive populations such as asthmatics. The Agency did not establish this new NAAQS and kept the existing standards. In 2010 the EPA decided to replace the dual primary standards with a new 1-hour standard set at 75 ppb. On March 20, 2012, the EPA "took final action" to maintain
344:
primary standard set at 100 ppb; the annual average of 0.053 ppm remained the same. Also considered was a new 1-hour secondary standard of 100 ppb. This was the first time the EPA reviewed the environmental impacts separate from the health impacts for this group of criteria air
297:, all of which are located in the Hawaii Volcanoes National Park. The violations occurred between 2007–2008 and the state of Hawaii suggested these should be exempt from regulatory actions due to an 'exceptional event' (volcanic activity). Since 1980 the national concentration of SO
265:
for additional monitoring systems above the minimum required. The EPA reports the national average concentration of CO has decreased by 82% since 1980. The last nonattainment designation was deemed in attainment on
September 27, 2010. Currently all areas in the US are in attainment.
844:(FEM). FEMs are based on different sampling and/or analyzing technologies than FRMs, but are required to provide the same decision making quality when making NAAQS attainment determinations. Approved new methods are formally announced through publication in the
339:
were both set at an annual average of 0.053 ppm. The EPA reviewed this NAAQS in 1985 and 1996, and in both cases concluded that the existing standard was sufficient. The most recent review by the EPA occurred in 2010, resulting in a new 1-hour
203:
of 'sensitive' populations such as asthmatics, children, and the elderly. The secondary standards are concerned with protecting the environment. They are designed to address visibility, damage to crops, vegetation, buildings, and animals.
3106:
368:
system during the summer "ozone season". This is intended to reduce ground-level ozone in non-attainment areas downwind of industrial sources like power plants, incinerators, and industrial furnaces, often in other
2708:
817:
As of June 15, 2005, the 1-hour ozone standard no longer applies to areas designated with respect to the 8-hour ozone standard (which includes most of the United States, except for portions of 10 states).
2778:
393:
1505:
2724:
3042:
353:
is reported to be averaging around 10–20 ppb, and is expected to decrease further with new mobile source regulations. Currently all areas of the US are classified as in attainment.
2762:
2732:
1377:
840:(FRM) to certify that the device has undergone a testing and analysis protocol, and can be used to monitor NAAQS compliance. Devices based on new technologies can be designated as a
3318:
3004:
2988:
2840:
1684:
3122:
335:
family as it is of the most concern due to its quick formation and contribution to the formation of harmful ground level ozone. In 1971 the primary and secondary NAAQS for NO
2912:
3942:
3559:
3462:
3090:
3074:
3058:
3050:
2996:
1988:
1900:
1005:
3738:
2664:
2382:
184:
3374:
2770:
2449:
2246:
4971:
3800:
3717:
3705:
3552:
3012:
2856:
2295:
3280:
2147:
1532:
1677:
3625:
3528:
397:
3368:
2368:
2267:
2016:
925:
3498:
3480:
2140:
1923:
1695:
1306:
1197:
3138:
3098:
1654:
1640:
3610:
2832:
2740:
1668:
1598:
301:
in the ambient air has decreased by 83%. Annual average concentrations hover between 1–6 ppb. Currently all ACQR's are in attainment for SO
4946:
2412:
2274:
1391:
1349:
3620:
2864:
2786:
2527:
2096:
3630:
3602:
3565:
2657:
2555:
2347:
2154:
1423:
90:
952:
681:
expected number of days per calendar year, with maximum hourly average concentration greater than 0.12 ppm, is equal to or less than 1
3545:
2848:
1861:
4936:
3849:
3486:
2802:
2794:
2039:
1981:
1946:
797:
767:
743:
709:
685:
651:
627:
593:
569:
545:
514:
480:
456:
382:
1307:"EPA Announces Final "Good Neighbor" Plan to Cut Harmful Smog, Protecting Health of Millions from Power Plant, Industrial Air Pollution"
856:
An air quality control region is an area, designated by the federal government, where communities share a common air pollution problem.
2888:
2880:
2214:
1838:
3238:
2588:
2313:
1704:
1525:
1418:"Reference and Equivalent Methods Used to Measure National Ambient Air Quality Standards (NAAQS) Criteria Air Pollutants - Volume I"
3201:
2650:
2581:
1953:
1559:
1550:
288:
year. The most recent review took place in 1996 during which the EPA considered implementing a new NAAQS for 5-minute peaks of SO
3773:
3635:
3444:
3440:
3436:
3432:
3428:
3424:
3420:
3416:
3412:
3408:
2477:
2302:
2191:
2170:
3571:
3468:
3456:
3130:
2932:
2053:
1661:
3816:
3337:
3114:
2597:
2331:
2103:
896:
833:
315:): The EPA first set primary and secondary standards for the oxides of nitrogen in 1971. Among these are nitric oxide (NO),
4961:
4941:
3516:
3474:
1893:
1780:
1584:
1518:
1500:
901:
3788:
3640:
2950:
2896:
2810:
2200:
2184:
1907:
1566:
17:
3510:
3274:
3034:
2972:
2942:
2681:
2288:
2207:
2124:
2046:
392:
Standards are required to "accurately reflect the latest scientific knowledge," and are reviewed every five years by a
1001:
239:(μm) to 10 μm in size (although current implementation includes all particles 10 μm or less in the standard)
4765:
3343:
3286:
3250:
3082:
2752:
2497:
2403:
2338:
1133:
72:
4956:
4389:
3768:
3748:
3615:
3504:
3450:
3325:
2389:
2324:
1056:
1030:
3842:
3404:
3361:
2673:
2620:
2426:
2110:
2025:
2009:
1967:
1824:
1633:
1626:
1619:
1612:
1605:
1373:
881:
199:
1264:
4951:
3695:
3675:
3386:
3331:
3213:
2980:
2962:
2463:
2456:
2060:
226:
117:
1796:
187:
cover many other chemicals, and require the maximum achievable reduction that the EPA determines is feasible.
3906:
3304:
2822:
2354:
2281:
2032:
1817:
94:
1489:
EPA Alumni
Association Oral History Video "Early Implementation of the Clean Air Act of 1970 in California."
1020:
Michigan
Department Of Environmental Quality, January 2004. What is an Air Contaminant Pollutant? Fact Sheet
4458:
4293:
3268:
2442:
2435:
1974:
1916:
1193:
4782:
3733:
3680:
3650:
3533:
3355:
2419:
2177:
1541:
1417:
1081:
4915:
4799:
4743:
3835:
3160:
2161:
1939:
34:
US counties that are designated "nonattainment" for the Clean Air Act's NAAQS, as of
September 30, 2017
491:
4330:
3723:
3660:
3539:
3522:
3392:
3298:
3262:
2629:
2470:
2089:
1886:
1845:
1335:
1152:
1392:"EPA scientists develop Federal Reference & Equivalent Methods for measuring key air pollutants"
293:
the existing NAAQS as they stood. Only three monitoring sites have exceeded the current NAAQS for SO
4315:
3811:
3806:
3743:
3066:
2253:
1831:
1757:
360:
In April 2023, the EPA finalized its "Good
Neighbor Plan", which phases in tighter standards for NO
4490:
4379:
3591:
3398:
2604:
2564:
2548:
2518:
2260:
2230:
956:
404:
4893:
4736:
4608:
2572:
2223:
1879:
165:
1787:
4690:
4685:
4480:
4421:
3711:
3700:
3585:
3578:
3292:
3256:
3168:
2700:
2131:
1331:
1102:
886:
4884:
4856:
4821:
4748:
4548:
4485:
4303:
4124:
3794:
3244:
2920:
2872:
2534:
1810:
1330:"Early Implementation of the Clean Air Act of 1970 in California." EPA Alumni Association.
1291:
891:
1510:
1472:
1227:
821:
8:
4879:
4787:
4775:
4665:
4618:
4426:
4349:
4075:
3866:
3690:
3685:
3207:
2692:
2504:
2239:
1732:
30:
1488:
4889:
4874:
4804:
4760:
4650:
4236:
4141:
3896:
2716:
2511:
1057:"National Ambient Air Quality Standards (NAAQS) | Air and Radiation | US EPA"
1031:"National Ambient Air Quality Standards (NAAQS) | Air and Radiation | US EPA"
216:
109:
1378:"Reconsideration of the National Ambient Air Quality Standards for Particulate Matter"
800:
770:
746:
712:
596:
548:
459:
4861:
4325:
4231:
4204:
4051:
4001:
3937:
3891:
3753:
3380:
3310:
3226:
2488:
2396:
1995:
1574:
871:
688:
654:
630:
572:
517:
483:
153:
4811:
4770:
4753:
4640:
4538:
4070:
3974:
3858:
3670:
2082:
1764:
1740:
845:
720:
403:
EPA has set NAAQS for six major pollutants listed as below. These six are also the
195:
The six criteria air pollutants were the first set of pollutants recognized by the
97:(42 U.S.C. 7401 et seq.), NAAQS is applied for outdoor air throughout the country.
49:
2642:
4828:
4794:
4680:
4660:
4570:
4219:
4185:
4119:
3916:
3901:
3349:
3186:
3024:
2904:
2541:
2361:
1854:
1773:
1591:
1246:
1201:
1180:
1137:
1116:
1009:
836:
can designate a measurement device using an established technological basis as a
604:
257:
133:
705:
Annual fourth-highest daily maximum 8-hour concentration, averaged over 3 years
385:
4869:
4816:
4726:
4645:
4630:
4625:
4577:
4465:
4261:
4209:
4192:
4026:
3763:
1748:
1725:
1711:
1259:
Fact Sheet – Air
Quality Designations for the 2010 Primary Nitrogen Dioxide (NO
433:
308:
161:
145:
3107:
Los
Angeles County Flood Control District v. Natural Resources Defense Council
1477:
978:
452:
99th Percentile of 1-hour daily maximum concentrations, averaged over 3 years
349:
concentrations has dropped by 52% since 1980. The annual concentration for NO
4966:
4930:
4833:
4670:
4560:
4517:
4298:
4175:
4061:
4011:
3875:
3778:
3758:
1960:
1495:
1277:
1265:
http://www.epa.gov/airquality/nitrogenoxides/designations/pdfs/20120120FS.pdf
953:"Trans-Alaska Pipeline System Renewal Environmental Impact Statement article"
866:
365:
316:
196:
78:
4635:
4593:
4369:
4320:
4256:
4112:
4016:
3665:
2002:
1213:
1166:
268:
177:
137:
1129:
4731:
4675:
4497:
4475:
4470:
4337:
4214:
4180:
4168:
4056:
3979:
3783:
2117:
1718:
1647:
169:
4838:
4655:
4613:
4555:
4524:
4163:
4095:
4033:
4006:
3969:
3219:
2073:
1060:
236:
173:
1803:
283:
is of greatest interest and is used as the indicator for the entire SO
4721:
4603:
4411:
4406:
4384:
4273:
4266:
4085:
4080:
3987:
3964:
3492:
3232:
3150:
2779:
Baltimore Gas & Electric Co. v. Natural Resources Defense Council
614:
279:
refers to the oxides of sulfur, a highly reactive group of gases. SO
86:
3827:
4848:
4416:
4342:
4283:
4278:
4226:
4136:
4107:
4100:
4090:
4021:
3995:
3991:
3983:
1930:
1034:
510:
Not to be exceeded more than once per year on average over 3 years
4716:
4512:
4507:
4453:
4359:
4288:
4131:
3932:
3319:
Scenic Hudson Preservation Conference v. Federal Power Commission
1482:
331:
is the oxide measured and used as the indicator for the entire NO
4565:
4530:
4354:
4310:
4158:
3956:
3005:
Weyerhaeuser Company v. United States Fish and Wildlife Service
2989:
Babbitt v. Sweet Home Chapter of Communities for a Great Oregon
1372:
1278:"National Air Quality: Status and Trends of Key Air Pollutants"
1214:"National Air Quality: Status and Trends of Key Air Pollutants"
1167:"National Air Quality: Status and Trends of Key Air Pollutants"
1085:
876:
763:
98th percentile of 1-hour daily maximum, averaged over 3 years
157:
3123:
National Association of Manufacturers v. Department of Defense
3075:
National Association of Home Builders v. Defenders of Wildlife
2997:
National Association of Home Builders v. Defenders of Wildlife
2913:
HollyFrontier Cheyenne Refining v. Renewable Fuels Association
926:"Definition of National Ambient Air Quality Standards (NAAQS)"
4598:
4438:
4364:
4151:
662:
1478:
US Environmental Protection Agency - Criteria Air Pollutants
4543:
4399:
4394:
4374:
4248:
4199:
4043:
3091:
Coeur Alaska, Inc. v. Southeast Alaska Conservation Council
3059:
S. D. Warren Co. v. Maine Board of Environmental Protection
3051:
South Florida Water Management District v. Miccosukee Tribe
1540:
778:
251:
129:
82:
4502:
4146:
3739:
National Emissions Standards for Hazardous Air Pollutants
2383:
National Emissions Standards for Hazardous Air Pollutants
1485:
showing non-attainment, maintenance, and attainment areas
1473:
EPA summary of the National Ambient Air Quality Standards
1350:"The latest chapter in EPA vs environmental science saga"
1181:"Sulfur Dioxide | Air & Radiation | US EPA"
185:
National Emissions Standards for Hazardous Air Pollutants
58:
2771:
Metropolitan Edison Co. v. People Against Nuclear Energy
2450:
Marine Protection, Research, and Sanctuaries Act of 1972
2247:
Congressional Budget and Impoundment Control Act of 1974
396:(CASAC), consisting of "seven members appointed by the
3013:
United States Fish and Wildlife Service v. Sierra Club
2857:
Alaska Department of Environmental Conservation v. EPA
2733:
Friends of the Earth v. Laidlaw Environmental Services
2296:
Emergency Daylight Saving Time Energy Conservation Act
2148:
National Institute for Occupational Safety and Health
73:
64:
61:
55:
3529:
Alien Species Prevention and Enforcement Act of 1992
1103:"Air Quality Criteria for Lead (Final Report, 2006)"
152:). These are typically emitted from many sources in
3369:
Federal Insecticide, Fungicide, and Rodenticide Act
2672:
2268:
Consolidated Farm and Rural Development Act of 1972
1924:
Federal Supplemental Educational Opportunity Grants
52:
3499:Emergency Planning and Community Right-to-Know Act
1493:
848:. A complete list of FRMs and FEMs is available.
3553:Coalition for Responsible Regulation, Inc. v. EPA
77:) are limits on atmospheric concentration of six
4928:
3611:Agency for Toxic Substances and Disease Registry
3375:Marine Protection, Research, and Sanctuaries Act
2741:BP P.L.C. v. Mayor and City Council of Baltimore
1416:Gilliam, Joseph H.; Hall, Eric S. (2016-07-13).
2413:National Oceanic and Atmospheric Administration
2275:Agriculture and Consumer Protection Act of 1973
1241:
1239:
1237:
89:, and other health hazards. Established by the
3621:National Highway Traffic Safety Administration
2865:Department of Transportation v. Public Citizen
2787:Department of Transportation v. Public Citizen
2097:National Highway Traffic Safety Administration
4972:United States Environmental Protection Agency
3843:
3631:United States Environmental Protection Agency
3281:Watershed Protection and Flood Prevention Act
2658:
2155:Occupational Safety and Health Administration
1526:
1445:"Document Display | NEPIS | US EPA"
851:
327:), all of which are covered in the NAAQS. NO
172:. In many cases they are the products of the
91:United States Environmental Protection Agency
2841:Chevron v. Natural Resources Defense Council
1234:
108:, for which limits are set in the NAAQS are
3487:Uranium Mill Tailings Radiation Control Act
2803:Winter v. Natural Resources Defense Council
2795:Norton v. Southern Utah Wilderness Alliance
2369:Federal Environmental Pesticide Control Act
1982:Health Maintenance Organization Act of 1973
1947:Equal Educational Opportunities Act of 1974
1415:
647:Not to be exceeded more than once per year
623:Not to be exceeded more than once per year
476:Not to be exceeded more than once per year
3850:
3836:
3481:Surface Mining Control and Reclamation Act
2889:American Electric Power Co. v. Connecticut
2881:Environmental Defense v. Duke Energy Corp.
2833:Train v. Natural Resources Defense Council
2665:
2651:
2215:Securities Investor Protection Corporation
1533:
1519:
3239:North Pacific Fur Seal Convention of 1911
3208:Forest Service Organic Administration Act
2849:Whitman v. American Trucking Associations
2185:Lead-Based Paint Poisoning Prevention Act
1347:
1263:) National Ambient Air Quality Standards
3202:Yellowstone National Park Protection Act
1954:Equal Employment Opportunity Act of 1972
1504:) is being considered for deletion. See
976:
535:9.0 μg/m (12 μg/m prior to May 6, 2024)
29:
3636:United States Fish and Wildlife Service
2478:Water Resources Development Act of 1974
2303:Trans-Alaska Pipeline Authorization Act
2192:Poison Prevention Packaging Act of 1970
2171:U.S. Consumer Product Safety Commission
1130:http://www.epa.gov/ncea/pdfs/coaqcd.pdf
589:98th percentile, averaged over 3 years
394:Clean Air Scientific Advisory Committee
27:US EPA limits on certain air pollutants
14:
4947:Environmental law in the United States
4929:
3729:National Ambient Air Quality Standards
3572:Infrastructure Investment and Jobs Act
3469:Resource Conservation and Recovery Act
3457:Hazardous Materials Transportation Act
3131:County of Maui v. Hawaii Wildlife Fund
2376:National Ambient Air Quality Standards
2054:Legislative Reorganization Act of 1970
1304:
40:National Ambient Air Quality Standards
3857:
3831:
3817:Uranium Mill Tailings Remedial Action
3338:Environmental Quality Improvement Act
3115:Army Corps of Engineers v. Hawkes Co.
2725:Lujan v. National Wildlife Federation
2646:
2332:Environmental Quality Improvement Act
2104:Urban Mass Transportation Act of 1970
1989:Drug Abuse Prevention and Control Act
1514:
1147:
1145:
897:Portable emissions measurement system
834:National Exposure Research Laboratory
3546:Energy Independence and Security Act
3517:National Environmental Education Act
1894:Minority Business Development Agency
1396:U.S. Environmental Protection Agency
1292:"Air Quality Planning and Standards"
1247:"Air Quality Planning and Standards"
1228:"Air Quality Planning and Standards"
1153:"Air Quality Planning and Standards"
1117:"Air Quality Planning and Standards"
1097:
1095:
947:
945:
920:
918:
902:Toxic Substances Control Act of 1976
827:
3789:Significant New Alternatives Policy
3641:U.S. Global Change Research Program
2951:Southern Union Co. v. United States
2897:Utility Air Regulatory Group v. EPA
2811:Monsanto Co. v. Geertson Seed Farms
2436:Great Lakes Water Quality Agreement
2201:Public Health Cigarette Smoking Act
1908:Alaska Native Claims Settlement Act
1839:Prevention of Nuclear War Agreement
1348:Goldstein, Bernard D (2018-12-11).
565:Annual mean, averaged over 3 years
541:Annual mean, averaged over 3 years
24:
4937:Air pollution in the United States
3566:America's Water Infrastructure Act
3556:(D.C. Cir. Court of Appeals, 2012)
3275:Fish and Wildlife Coordination Act
3035:United States v. Riverside Bayview
2973:Tennessee Valley Authority v. Hill
2943:City of Philadelphia v. New Jersey
2289:Emergency Petroleum Allocation Act
2208:Securities Investor Protection Act
2141:Occupational Safety and Health Act
2125:Economic Stabilization Act of 1970
2047:District of Columbia Home Rule Act
1341:
1142:
979:"Criteria Air Pollutants | US EPA"
25:
4983:
3582:(5th Cir. Court of Appeals, 2022)
3344:National Environmental Policy Act
3322:(2nd Cir. Court of Appeals, 1965)
3083:Entergy Corp. v. Riverkeeper Inc.
3043:SWANCC v. Army Corps of Engineers
2404:Reorganization Plan No. 3 of 1970
2339:National Environmental Policy Act
1508:to help reach a consensus. ›
1466:
1092:
942:
915:
4911:
4910:
3769:Presidential Climate Action Plan
3749:New Source Performance Standards
3616:Council on Environmental Quality
3505:Emergency Wetlands Resources Act
2390:New Source Performance Standards
2325:Council on Environmental Quality
48:
3405:Water Resources Development Act
3362:Coastal Zone Management Program
2674:United States environmental law
2427:Coastal Zone Management Program
2348:Environmental Protection Agency
2111:Federal-Aid Highway Act of 1973
2026:Federal Contested Elections Act
2010:Drug Enforcement Administration
1968:End Stage Renal Disease Program
1437:
1424:Environmental Protection Agency
1409:
1384:
1374:Environmental Protection Agency
1366:
1324:
1298:
1284:
1270:
1253:
1220:
1206:
1187:
1173:
1159:
1123:
1109:
882:Atmospheric dispersion modeling
210:
200:Environmental Protection Agency
3696:Environmental impact statement
3676:Corporate average fuel economy
3560:Lautenberg Chemical Safety Act
2981:Lujan v. Defenders of Wildlife
2464:Endangered Species Act of 1973
2457:Endangered Species Act of 1969
2061:Congressional Research Service
1641:VP confirmation of Gerald Ford
1074:
1049:
1023:
1014:
995:
970:
810:
227:Atmospheric particulate matter
118:atmospheric particulate matter
13:
1:
2282:Federal Energy Administration
2033:Federal Election Campaign Act
1818:Anti-Ballistic Missile Treaty
977:EPA, OAR, US (9 April 2014).
908:
190:
93:(EPA) under authority of the
3876:Pollution / quality
3475:Toxic Substances Control Act
2443:Marine Mammal Protection Act
2355:Clean Air Amendments of 1970
1975:Supplemental Security Income
1917:Education Amendments of 1972
1305:US EPA, OA (15 March 2023).
380:The standards are listed in
375:
323:O), and nitrogen dioxide (NO
7:
4962:Natural resource management
4942:Air pollution organizations
3734:National Climate Assessment
3681:Discharge Monitoring Report
3534:Food Quality Protection Act
3356:Coastal Zone Management Act
2420:Coastal Zone Management Act
2178:Consumer Product Safety Act
1961:National Cancer Act of 1971
1599:1970 Lincoln Memorial visit
1542:Presidency of Richard Nixon
1501:Presidency of Richard Nixon
859:
525:Fine particulate matter (PM
10:
4988:
3511:Global Change Research Act
3161:United States v. Bestfoods
2582:Senate Watergate Committee
2162:Permissible exposure limit
1940:Rehabilitation Act of 1973
1685:Presidential Proclamations
852:Air quality control region
812:
4906:
4847:
4712:
4705:
4586:
4447:Types / location
4446:
4437:
4247:
4042:
3955:
3925:
3874:
3865:
3784:Section 608 Certification
3724:Maximum contaminant level
3661:Best available technology
3649:
3601:
3307:(1963, 1970, 1977, 1990)
3287:Air Pollution Control Act
3251:Migratory Bird Treaty Act
3183:
3149:
3023:
2961:
2931:
2821:
2751:
2680:
2614:
2487:
2471:Oil Pollution Act of 1973
2312:
2090:Fair Credit Reporting Act
2072:
1887:Revised Philadelphia Plan
1871:
1846:Threshold Test Ban Treaty
1694:
1549:
842:Federal Equivalent Method
719:
661:
603:
524:
432:
180:or industrial processes.
3812:Toxicity category rating
3807:Total maximum daily load
3744:National Priorities List
3626:Office of Surface Mining
3451:Federal Noxious Weed Act
3352:(1972, 1977, 1987, 2014)
3326:Solid Waste Disposal Act
3067:Rapanos v. United States
2621:← Johnson administration
2254:Agricultural Act of 1970
1797:1973 Chilean coup d'état
1506:templates for discussion
1338:(see p4). July 12, 2016.
838:Federal Reference Method
235:, coarse particles: 2.5
4957:Environmental chemistry
3774:Renewable Fuel Standard
3592:Inflation Reduction Act
3399:Safe Drinking Water Act
2519:Saturday Night Massacre
2261:Farm Credit Act of 1971
2231:Alternative minimum tax
405:criteria air pollutants
102:criteria air pollutants
3387:Endangered Species Act
3332:Endangered Species Act
3214:Rivers and Harbors Act
2763:United States v. SCRAP
2709:Vermont Yankee v. NRDC
2573:United States v. Nixon
2224:Tax Reform Act of 1969
1901:Native American policy
1880:Family Assistance Plan
784:Primary and Secondary
730:Primary and Secondary
696:Primary and Secondary
672:Primary and Secondary
580:Primary and Secondary
501:Primary and Secondary
166:electricity generation
35:
4952:Environmental science
3712:Executive Order 13990
3706:Executive Order 13432
3701:Environmental justice
3586:CHIPS and Science Act
3293:Fish and Wildlife Act
3169:Guam v. United States
2701:Sierra Club v. Morton
2630:Ford administration →
2132:Smithsonian Agreement
1655:Judicial appointments
887:Contamination control
757:0.100 ppm (188 μg/m)
733:0.053 ppm (100 μg/m)
699:0.070 ppm (140 μg/m)
641:9 ppm (10 mg/m)
470:0.5 ppm (1,300 μg/m)
33:
4822:remnant natural area
4459:storage and recovery
4125:habitat conservation
3943:Deforestation (REDD)
3795:State of the Climate
3463:Magnuson–Stevens Act
3269:McSweeney-McNary Act
2921:West Virginia v. EPA
2873:Massachusetts v. EPA
2535:White House Plumbers
930:ohioepa.custhelp.com
892:Clean Air Act (1990)
675:0.12 ppm (235 μg/m)
428:Regulatory Citation
4776:Earth Overshoot Day
4350:Marine conservation
4331:non-timber products
3759:Not-To-Exceed (NTE)
3691:Environmental crime
3686:Effluent guidelines
3447:, 2014, 2016, 2022)
3187:federal legislation
2693:Missouri v. Holland
2589:impeachment process
2505:Operation Sandwedge
2240:Revenue Act of 1971
2040:1970 VRA Amendments
1788:Shanghai Communiqué
1781:1972 visit to China
1733:Paris Peace Accords
1705:International trips
1585:Second inauguration
793:Not to be exceeded
425:Exceedance Criteria
106:criteria pollutants
18:Criteria pollutants
4761:Ecosystem services
3884:Ambient standards
3579:Louisiana v. Biden
3493:CERCLA (Superfund)
3401:(1974, 1986, 1996)
2717:Hughes v. Oklahoma
2512:Operation Gemstone
1811:1972 Moscow Summit
1567:First inauguration
1200:2016-04-15 at the
1136:2011-02-12 at the
1008:2020-02-29 at the
492:Particulate matter
217:Ground level ozone
36:
4924:
4923:
4902:
4901:
4701:
4700:
4380:genetic resources
4316:genetic resources
3951:
3950:
3859:Natural resources
3825:
3824:
3754:New Source Review
3540:Energy Policy Act
3523:Oil Pollution Act
3393:Oil Pollution Act
3381:Noise Control Act
3311:Acid Rain Program
3299:Oil Pollution Act
3263:Oil Pollution Act
3257:Clarke–McNary Act
3179:
3178:
3139:Sackett v. EPA II
2640:
2639:
2565:White House tapes
2556:list of opponents
2397:Noise Control Act
1996:Shafer Commission
1862:Space exploration
1832:Washington Summit
1726:Cambodian bombing
1634:1974 SOTU Address
1627:1973 SOTU Address
1620:1972 SOTU Address
1613:1971 SOTU Address
1606:1970 SOTU Address
1575:Bring Us Together
1082:"EPA - TTN NAAQS"
872:Air quality index
828:Detection methods
807:
806:
790:Rolling 3 months
398:EPA administrator
16:(Redirected from
4979:
4914:
4913:
4865:
4812:Natural heritage
4771:overexploitation
4710:
4709:
4444:
4443:
4390:herbal medicines
4370:FAO Plant Treaty
3910:
3887:
3872:
3871:
3852:
3845:
3838:
3829:
3828:
3671:Clean Power Plan
3603:Federal agencies
3245:Weeks–McLean Act
3099:Sackett v. EPA I
2749:
2748:
2667:
2660:
2653:
2644:
2643:
2633:
2624:
2607:
2600:
2591:
2584:
2577:
2567:
2558:
2551:
2544:
2537:
2530:
2521:
2514:
2507:
2500:
2480:
2473:
2466:
2459:
2452:
2445:
2438:
2429:
2422:
2415:
2406:
2399:
2392:
2385:
2378:
2371:
2364:
2357:
2350:
2341:
2334:
2327:
2305:
2298:
2291:
2284:
2277:
2270:
2263:
2256:
2249:
2242:
2233:
2226:
2217:
2210:
2203:
2194:
2187:
2180:
2173:
2164:
2157:
2150:
2143:
2134:
2127:
2120:
2113:
2106:
2099:
2092:
2085:
2083:Bank Secrecy Act
2063:
2056:
2049:
2042:
2035:
2028:
2019:
2012:
2005:
1998:
1991:
1984:
1977:
1970:
1963:
1956:
1949:
1942:
1933:
1926:
1919:
1910:
1903:
1896:
1889:
1882:
1864:
1857:
1848:
1841:
1834:
1827:
1820:
1813:
1806:
1799:
1790:
1783:
1776:
1767:
1760:
1751:
1744:
1741:Peace with Honor
1735:
1728:
1721:
1714:
1707:
1687:
1680:
1678:Executive Orders
1671:
1664:
1657:
1650:
1643:
1636:
1629:
1622:
1615:
1608:
1601:
1594:
1587:
1578:
1569:
1562:
1535:
1528:
1521:
1512:
1511:
1460:
1459:
1457:
1455:
1441:
1435:
1434:
1432:
1431:
1413:
1407:
1406:
1404:
1403:
1388:
1382:
1381:
1376:(6 March 2024).
1370:
1364:
1363:
1361:
1360:
1345:
1339:
1328:
1322:
1321:
1319:
1317:
1302:
1296:
1295:
1288:
1282:
1281:
1274:
1268:
1257:
1251:
1250:
1243:
1232:
1231:
1224:
1218:
1217:
1210:
1204:
1191:
1185:
1184:
1177:
1171:
1170:
1163:
1157:
1156:
1149:
1140:
1127:
1121:
1120:
1113:
1107:
1106:
1099:
1090:
1089:
1084:. Archived from
1078:
1072:
1071:
1069:
1068:
1059:. Archived from
1053:
1047:
1045:
1043:
1042:
1033:. Archived from
1027:
1021:
1018:
1012:
999:
993:
992:
990:
989:
974:
968:
967:
965:
964:
955:. Archived from
949:
940:
939:
937:
936:
922:
846:Federal Register
816:
803:
773:
749:
721:Nitrogen dioxide
715:
691:
657:
633:
599:
575:
551:
520:
486:
462:
410:
409:
388:
71:
70:
67:
66:
63:
60:
57:
54:
21:
4987:
4986:
4982:
4981:
4980:
4978:
4977:
4976:
4927:
4926:
4925:
4920:
4898:
4863:
4843:
4829:Systems ecology
4795:Natural capital
4697:
4582:
4571:reclaimed water
4433:
4395:UPOV Convention
4243:
4038:
3947:
3921:
3917:Ozone depletion
3908:
3885:
3861:
3856:
3826:
3821:
3653:
3645:
3597:
3350:Clean Water Act
3194:
3193:and lower court
3192:
3190:
3185:
3175:
3145:
3019:
2957:
2927:
2905:Michigan v. EPA
2817:
2747:
2684:
2676:
2671:
2641:
2636:
2627:
2618:
2610:
2603:
2596:
2587:
2580:
2570:
2563:
2554:
2547:
2542:Watergate Seven
2540:
2533:
2526:
2517:
2510:
2503:
2496:
2483:
2476:
2469:
2462:
2455:
2448:
2441:
2434:
2425:
2418:
2411:
2402:
2395:
2388:
2381:
2374:
2367:
2362:Clean Water Act
2360:
2353:
2346:
2337:
2330:
2323:
2315:
2308:
2301:
2294:
2287:
2280:
2273:
2266:
2259:
2252:
2245:
2238:
2229:
2222:
2213:
2206:
2199:
2190:
2183:
2176:
2169:
2160:
2153:
2146:
2139:
2130:
2123:
2116:
2109:
2102:
2095:
2088:
2081:
2074:Economic policy
2068:
2059:
2052:
2045:
2038:
2031:
2024:
2017:Cannabis policy
2015:
2008:
2001:
1994:
1987:
1980:
1973:
1966:
1959:
1952:
1945:
1938:
1929:
1922:
1915:
1906:
1899:
1892:
1885:
1878:
1872:Domestic policy
1867:
1860:
1855:Operation CHAOS
1853:
1844:
1837:
1830:
1823:
1816:
1809:
1802:
1795:
1786:
1779:
1774:Tar Baby option
1772:
1763:
1758:Cold War period
1756:
1747:
1738:
1731:
1724:
1717:
1710:
1703:
1690:
1683:
1676:
1667:
1660:
1653:
1646:
1639:
1632:
1625:
1618:
1611:
1604:
1597:
1592:Silent majority
1590:
1583:
1572:
1565:
1558:
1545:
1539:
1509:
1469:
1464:
1463:
1453:
1451:
1443:
1442:
1438:
1429:
1427:
1414:
1410:
1401:
1399:
1390:
1389:
1385:
1371:
1367:
1358:
1356:
1346:
1342:
1329:
1325:
1315:
1313:
1303:
1299:
1290:
1289:
1285:
1276:
1275:
1271:
1262:
1258:
1254:
1245:
1244:
1235:
1226:
1225:
1221:
1212:
1211:
1207:
1202:Wayback Machine
1192:
1188:
1179:
1178:
1174:
1165:
1164:
1160:
1151:
1150:
1143:
1138:Wayback Machine
1128:
1124:
1115:
1114:
1110:
1101:
1100:
1093:
1080:
1079:
1075:
1066:
1064:
1055:
1054:
1050:
1040:
1038:
1029:
1028:
1024:
1019:
1015:
1010:Wayback Machine
1000:
996:
987:
985:
975:
971:
962:
960:
951:
950:
943:
934:
932:
924:
923:
916:
911:
906:
862:
854:
830:
796:
766:
742:
726:
708:
684:
668:
650:
626:
605:Carbon monoxide
592:
568:
544:
528:
513:
497:
479:
455:
439:
381:
378:
363:
352:
348:
343:
338:
334:
330:
326:
322:
314:
309:Nitrogen oxides
304:
300:
296:
291:
286:
282:
278:
274:
263:
258:Carbon monoxide
245:
234:
222:
213:
193:
151:
146:nitrogen oxides
143:
134:carbon monoxide
127:
123:
115:
51:
47:
28:
23:
22:
15:
12:
11:
5:
4985:
4975:
4974:
4969:
4964:
4959:
4954:
4949:
4944:
4939:
4922:
4921:
4919:
4918:
4907:
4904:
4903:
4900:
4899:
4897:
4896:
4887:
4882:
4877:
4872:
4867:
4864:(perpetuation)
4859:
4853:
4851:
4845:
4844:
4842:
4841:
4836:
4831:
4826:
4825:
4824:
4817:Nature reserve
4814:
4809:
4808:
4807:
4802:
4792:
4791:
4790:
4780:
4779:
4778:
4773:
4763:
4758:
4757:
4756:
4751:
4741:
4740:
4739:
4734:
4729:
4724:
4713:
4707:
4703:
4702:
4699:
4698:
4696:
4695:
4694:
4693:
4688:
4678:
4673:
4668:
4663:
4658:
4653:
4648:
4643:
4638:
4633:
4628:
4623:
4622:
4621:
4611:
4606:
4601:
4596:
4590:
4588:
4584:
4583:
4581:
4580:
4575:
4574:
4573:
4563:
4558:
4553:
4552:
4551:
4541:
4536:
4535:
4534:
4522:
4521:
4520:
4515:
4510:
4500:
4495:
4494:
4493:
4488:
4483:
4473:
4468:
4463:
4462:
4461:
4450:
4448:
4441:
4435:
4434:
4432:
4431:
4430:
4429:
4424:
4414:
4409:
4404:
4403:
4402:
4397:
4392:
4387:
4382:
4377:
4372:
4362:
4357:
4352:
4347:
4346:
4345:
4335:
4334:
4333:
4328:
4323:
4318:
4308:
4307:
4306:
4301:
4296:
4294:climate change
4286:
4281:
4276:
4271:
4270:
4269:
4262:Bioprospecting
4259:
4253:
4251:
4245:
4244:
4242:
4241:
4240:
4239:
4234:
4224:
4223:
4222:
4217:
4212:
4207:
4197:
4196:
4195:
4190:
4189:
4188:
4183:
4173:
4172:
4171:
4166:
4156:
4155:
4154:
4144:
4139:
4129:
4128:
4127:
4117:
4116:
4115:
4105:
4104:
4103:
4098:
4093:
4088:
4078:
4073:
4068:
4067:
4066:
4065:
4064:
4048:
4046:
4040:
4039:
4037:
4036:
4031:
4030:
4029:
4024:
4014:
4009:
4004:
3999:
3977:
3972:
3967:
3961:
3959:
3953:
3952:
3949:
3948:
3946:
3945:
3940:
3935:
3929:
3927:
3923:
3922:
3920:
3919:
3914:
3913:
3912:
3907:Clean Air Act
3899:
3894:
3889:
3880:
3878:
3869:
3863:
3862:
3855:
3854:
3847:
3840:
3832:
3823:
3822:
3820:
3819:
3814:
3809:
3804:
3801:Tailoring Rule
3798:
3791:
3786:
3781:
3776:
3771:
3766:
3764:PACE financing
3761:
3756:
3751:
3746:
3741:
3736:
3731:
3726:
3721:
3715:
3709:
3703:
3698:
3693:
3688:
3683:
3678:
3673:
3668:
3663:
3657:
3655:
3647:
3646:
3644:
3643:
3638:
3633:
3628:
3623:
3618:
3613:
3607:
3605:
3599:
3598:
3596:
3595:
3589:
3583:
3575:
3569:
3563:
3557:
3549:
3543:
3537:
3531:
3526:
3520:
3514:
3508:
3502:
3496:
3490:
3484:
3478:
3472:
3466:
3460:
3454:
3448:
3402:
3396:
3390:
3384:
3378:
3372:
3366:
3365:
3364:
3353:
3347:
3341:
3335:
3329:
3323:
3315:
3314:
3313:
3302:
3296:
3290:
3284:
3278:
3272:
3266:
3260:
3254:
3248:
3242:
3236:
3230:
3224:
3223:
3222:
3211:
3205:
3198:
3196:
3181:
3180:
3177:
3176:
3174:
3173:
3165:
3156:
3154:
3147:
3146:
3144:
3143:
3135:
3127:
3119:
3111:
3103:
3095:
3087:
3079:
3071:
3063:
3055:
3047:
3039:
3030:
3028:
3021:
3020:
3018:
3017:
3009:
3001:
2993:
2985:
2977:
2968:
2966:
2959:
2958:
2956:
2955:
2947:
2938:
2936:
2929:
2928:
2926:
2925:
2917:
2909:
2901:
2893:
2885:
2877:
2869:
2861:
2853:
2845:
2837:
2828:
2826:
2819:
2818:
2816:
2815:
2807:
2799:
2791:
2783:
2775:
2767:
2758:
2756:
2746:
2745:
2737:
2729:
2721:
2713:
2705:
2697:
2688:
2686:
2678:
2677:
2670:
2669:
2662:
2655:
2647:
2638:
2637:
2635:
2634:
2625:
2615:
2612:
2611:
2609:
2608:
2601:
2594:
2593:
2592:
2578:
2568:
2561:
2560:
2559:
2545:
2538:
2531:
2524:
2523:
2522:
2515:
2508:
2493:
2491:
2485:
2484:
2482:
2481:
2474:
2467:
2460:
2453:
2446:
2439:
2432:
2431:
2430:
2416:
2409:
2408:
2407:
2400:
2393:
2386:
2379:
2372:
2365:
2358:
2344:
2343:
2342:
2335:
2320:
2318:
2310:
2309:
2307:
2306:
2299:
2292:
2285:
2278:
2271:
2264:
2257:
2250:
2243:
2236:
2235:
2234:
2220:
2219:
2218:
2204:
2197:
2196:
2195:
2188:
2181:
2167:
2166:
2165:
2158:
2151:
2137:
2136:
2135:
2128:
2114:
2107:
2100:
2093:
2086:
2078:
2076:
2070:
2069:
2067:
2066:
2065:
2064:
2050:
2043:
2036:
2029:
2022:
2021:
2020:
2013:
1999:
1992:
1985:
1978:
1971:
1964:
1957:
1950:
1943:
1936:
1935:
1934:
1927:
1913:
1912:
1911:
1897:
1890:
1883:
1875:
1873:
1869:
1868:
1866:
1865:
1858:
1851:
1850:
1849:
1842:
1835:
1828:
1821:
1814:
1800:
1793:
1792:
1791:
1777:
1770:
1769:
1768:
1765:Linkage policy
1754:
1753:
1752:
1749:Vietnamization
1745:
1736:
1729:
1715:
1712:Nixon Doctrine
1708:
1700:
1698:
1696:Foreign policy
1692:
1691:
1689:
1688:
1681:
1674:
1673:
1672:
1665:
1651:
1644:
1637:
1630:
1623:
1616:
1609:
1602:
1595:
1588:
1581:
1580:
1579:
1563:
1555:
1553:
1547:
1546:
1538:
1537:
1530:
1523:
1515:
1492:
1491:
1486:
1483:EPA Green Book
1480:
1475:
1468:
1467:External links
1465:
1462:
1461:
1436:
1408:
1383:
1365:
1340:
1323:
1297:
1283:
1280:. 8 July 2014.
1269:
1260:
1252:
1233:
1219:
1216:. 8 July 2014.
1205:
1186:
1172:
1169:. 8 July 2014.
1158:
1141:
1122:
1108:
1091:
1088:on 2009-04-28.
1073:
1048:
1022:
1013:
994:
969:
941:
913:
912:
910:
907:
905:
904:
899:
894:
889:
884:
879:
874:
869:
863:
861:
858:
853:
850:
829:
826:
825:
824:
818:
805:
804:
794:
791:
788:
785:
782:
775:
774:
764:
761:
758:
755:
751:
750:
740:
737:
734:
731:
728:
724:
717:
716:
706:
703:
700:
697:
693:
692:
682:
679:
676:
673:
670:
666:
659:
658:
648:
645:
642:
639:
635:
634:
624:
621:
618:
611:
608:
601:
600:
590:
587:
584:
581:
577:
576:
566:
563:
560:
557:
553:
552:
542:
539:
536:
533:
530:
526:
522:
521:
511:
508:
505:
502:
499:
495:
488:
487:
477:
474:
471:
468:
464:
463:
453:
450:
447:
444:
441:
437:
434:Sulfur dioxide
430:
429:
426:
423:
422:Averaging Time
420:
417:
414:
377:
374:
373:
372:
371:
370:
361:
355:
354:
350:
346:
341:
336:
332:
328:
324:
320:
312:
306:
302:
298:
294:
289:
284:
280:
276:
272:
266:
261:
255:
249:
248:
247:
243:
240:
232:
224:
220:
212:
209:
192:
189:
162:transportation
149:
141:
125:
121:
113:
26:
9:
6:
4:
3:
2:
4984:
4973:
4970:
4968:
4965:
4963:
4960:
4958:
4955:
4953:
4950:
4948:
4945:
4943:
4940:
4938:
4935:
4934:
4932:
4917:
4909:
4908:
4905:
4895:
4894:Non-renewable
4891:
4888:
4886:
4883:
4881:
4878:
4876:
4873:
4871:
4868:
4866:
4860:
4858:
4855:
4854:
4852:
4850:
4846:
4840:
4837:
4835:
4834:Urban ecology
4832:
4830:
4827:
4823:
4820:
4819:
4818:
4815:
4813:
4810:
4806:
4803:
4801:
4798:
4797:
4796:
4793:
4789:
4786:
4785:
4784:
4781:
4777:
4774:
4772:
4769:
4768:
4767:
4764:
4762:
4759:
4755:
4752:
4750:
4747:
4746:
4745:
4742:
4738:
4735:
4733:
4730:
4728:
4725:
4723:
4720:
4719:
4718:
4715:
4714:
4711:
4708:
4704:
4692:
4689:
4687:
4684:
4683:
4682:
4679:
4677:
4674:
4672:
4669:
4667:
4666:Privatization
4664:
4662:
4659:
4657:
4654:
4652:
4649:
4647:
4644:
4642:
4639:
4637:
4634:
4632:
4629:
4627:
4624:
4620:
4617:
4616:
4615:
4612:
4610:
4607:
4605:
4602:
4600:
4597:
4595:
4592:
4591:
4589:
4585:
4579:
4576:
4572:
4569:
4568:
4567:
4564:
4562:
4561:Surface water
4559:
4557:
4554:
4550:
4547:
4546:
4545:
4542:
4540:
4537:
4533:
4532:
4528:
4527:
4526:
4523:
4519:
4516:
4514:
4511:
4509:
4506:
4505:
4504:
4501:
4499:
4496:
4492:
4489:
4487:
4484:
4482:
4479:
4478:
4477:
4474:
4472:
4469:
4467:
4464:
4460:
4457:
4456:
4455:
4452:
4451:
4449:
4445:
4442:
4440:
4436:
4428:
4425:
4423:
4420:
4419:
4418:
4415:
4413:
4410:
4408:
4405:
4401:
4398:
4396:
4393:
4391:
4388:
4386:
4383:
4381:
4378:
4376:
4373:
4371:
4368:
4367:
4366:
4363:
4361:
4358:
4356:
4353:
4351:
4348:
4344:
4341:
4340:
4339:
4336:
4332:
4329:
4327:
4324:
4322:
4319:
4317:
4314:
4313:
4312:
4309:
4305:
4302:
4300:
4297:
4295:
4292:
4291:
4290:
4287:
4285:
4282:
4280:
4277:
4275:
4272:
4268:
4265:
4264:
4263:
4260:
4258:
4255:
4254:
4252:
4250:
4246:
4238:
4235:
4233:
4230:
4229:
4228:
4225:
4221:
4218:
4216:
4213:
4211:
4208:
4206:
4203:
4202:
4201:
4198:
4194:
4191:
4187:
4184:
4182:
4179:
4178:
4177:
4174:
4170:
4167:
4165:
4162:
4161:
4160:
4157:
4153:
4150:
4149:
4148:
4145:
4143:
4140:
4138:
4135:
4134:
4133:
4130:
4126:
4123:
4122:
4121:
4118:
4114:
4111:
4110:
4109:
4106:
4102:
4099:
4097:
4094:
4092:
4089:
4087:
4084:
4083:
4082:
4079:
4077:
4074:
4072:
4069:
4063:
4062:peak farmland
4060:
4059:
4058:
4055:
4054:
4053:
4050:
4049:
4047:
4045:
4041:
4035:
4032:
4028:
4025:
4023:
4020:
4019:
4018:
4015:
4013:
4010:
4008:
4005:
4003:
4000:
3997:
3993:
3989:
3985:
3981:
3978:
3976:
3973:
3971:
3968:
3966:
3963:
3962:
3960:
3958:
3954:
3944:
3941:
3939:
3936:
3934:
3931:
3930:
3928:
3924:
3918:
3915:
3911:
3905:
3904:
3903:
3900:
3898:
3895:
3893:
3890:
3888:
3882:
3881:
3879:
3877:
3873:
3870:
3868:
3864:
3860:
3853:
3848:
3846:
3841:
3839:
3834:
3833:
3830:
3818:
3815:
3813:
3810:
3808:
3805:
3802:
3799:
3797:
3796:
3792:
3790:
3787:
3785:
3782:
3780:
3779:Right to know
3777:
3775:
3772:
3770:
3767:
3765:
3762:
3760:
3757:
3755:
3752:
3750:
3747:
3745:
3742:
3740:
3737:
3735:
3732:
3730:
3727:
3725:
3722:
3719:
3716:
3713:
3710:
3707:
3704:
3702:
3699:
3697:
3694:
3692:
3689:
3687:
3684:
3682:
3679:
3677:
3674:
3672:
3669:
3667:
3664:
3662:
3659:
3658:
3656:
3652:
3648:
3642:
3639:
3637:
3634:
3632:
3629:
3627:
3624:
3622:
3619:
3617:
3614:
3612:
3609:
3608:
3606:
3604:
3600:
3593:
3590:
3587:
3584:
3581:
3580:
3576:
3573:
3570:
3567:
3564:
3561:
3558:
3555:
3554:
3550:
3547:
3544:
3541:
3538:
3535:
3532:
3530:
3527:
3524:
3521:
3518:
3515:
3512:
3509:
3506:
3503:
3500:
3497:
3494:
3491:
3488:
3485:
3482:
3479:
3476:
3473:
3470:
3467:
3464:
3461:
3458:
3455:
3452:
3449:
3446:
3442:
3438:
3434:
3430:
3426:
3422:
3418:
3414:
3410:
3406:
3403:
3400:
3397:
3394:
3391:
3388:
3385:
3382:
3379:
3376:
3373:
3370:
3367:
3363:
3360:
3359:
3357:
3354:
3351:
3348:
3345:
3342:
3339:
3336:
3333:
3330:
3327:
3324:
3321:
3320:
3316:
3312:
3309:
3308:
3306:
3305:Clean Air Act
3303:
3300:
3297:
3294:
3291:
3288:
3285:
3282:
3279:
3276:
3273:
3270:
3267:
3264:
3261:
3258:
3255:
3252:
3249:
3246:
3243:
3240:
3237:
3234:
3231:
3228:
3225:
3221:
3218:
3217:
3215:
3212:
3209:
3206:
3203:
3200:
3199:
3197:
3188:
3182:
3171:
3170:
3166:
3163:
3162:
3158:
3157:
3155:
3152:
3148:
3141:
3140:
3136:
3133:
3132:
3128:
3125:
3124:
3120:
3117:
3116:
3112:
3109:
3108:
3104:
3101:
3100:
3096:
3093:
3092:
3088:
3085:
3084:
3080:
3077:
3076:
3072:
3069:
3068:
3064:
3061:
3060:
3056:
3053:
3052:
3048:
3045:
3044:
3040:
3037:
3036:
3032:
3031:
3029:
3026:
3022:
3015:
3014:
3010:
3007:
3006:
3002:
2999:
2998:
2994:
2991:
2990:
2986:
2983:
2982:
2978:
2975:
2974:
2970:
2969:
2967:
2964:
2960:
2953:
2952:
2948:
2945:
2944:
2940:
2939:
2937:
2934:
2930:
2923:
2922:
2918:
2915:
2914:
2910:
2907:
2906:
2902:
2899:
2898:
2894:
2891:
2890:
2886:
2883:
2882:
2878:
2875:
2874:
2870:
2867:
2866:
2862:
2859:
2858:
2854:
2851:
2850:
2846:
2843:
2842:
2838:
2835:
2834:
2830:
2829:
2827:
2824:
2820:
2813:
2812:
2808:
2805:
2804:
2800:
2797:
2796:
2792:
2789:
2788:
2784:
2781:
2780:
2776:
2773:
2772:
2768:
2765:
2764:
2760:
2759:
2757:
2754:
2750:
2743:
2742:
2738:
2735:
2734:
2730:
2727:
2726:
2722:
2719:
2718:
2714:
2711:
2710:
2706:
2703:
2702:
2698:
2695:
2694:
2690:
2689:
2687:
2683:
2682:Supreme Court
2679:
2675:
2668:
2663:
2661:
2656:
2654:
2649:
2648:
2645:
2632:
2631:
2626:
2623:
2622:
2617:
2616:
2613:
2606:
2602:
2599:
2595:
2590:
2586:
2585:
2583:
2579:
2575:
2574:
2569:
2566:
2562:
2557:
2553:
2552:
2550:
2546:
2543:
2539:
2536:
2532:
2529:
2525:
2520:
2516:
2513:
2509:
2506:
2502:
2501:
2499:
2495:
2494:
2492:
2490:
2486:
2479:
2475:
2472:
2468:
2465:
2461:
2458:
2454:
2451:
2447:
2444:
2440:
2437:
2433:
2428:
2424:
2423:
2421:
2417:
2414:
2410:
2405:
2401:
2398:
2394:
2391:
2387:
2384:
2380:
2377:
2373:
2370:
2366:
2363:
2359:
2356:
2352:
2351:
2349:
2345:
2340:
2336:
2333:
2329:
2328:
2326:
2322:
2321:
2319:
2317:
2314:Environmental
2311:
2304:
2300:
2297:
2293:
2290:
2286:
2283:
2279:
2276:
2272:
2269:
2265:
2262:
2258:
2255:
2251:
2248:
2244:
2241:
2237:
2232:
2228:
2227:
2225:
2221:
2216:
2212:
2211:
2209:
2205:
2202:
2198:
2193:
2189:
2186:
2182:
2179:
2175:
2174:
2172:
2168:
2163:
2159:
2156:
2152:
2149:
2145:
2144:
2142:
2138:
2133:
2129:
2126:
2122:
2121:
2119:
2115:
2112:
2108:
2105:
2101:
2098:
2094:
2091:
2087:
2084:
2080:
2079:
2077:
2075:
2071:
2062:
2058:
2057:
2055:
2051:
2048:
2044:
2041:
2037:
2034:
2030:
2027:
2023:
2018:
2014:
2011:
2007:
2006:
2004:
2000:
1997:
1993:
1990:
1986:
1983:
1979:
1976:
1972:
1969:
1965:
1962:
1958:
1955:
1951:
1948:
1944:
1941:
1937:
1932:
1928:
1925:
1921:
1920:
1918:
1914:
1909:
1905:
1904:
1902:
1898:
1895:
1891:
1888:
1884:
1881:
1877:
1876:
1874:
1870:
1863:
1859:
1856:
1852:
1847:
1843:
1840:
1836:
1833:
1829:
1826:
1825:SALT I Treaty
1822:
1819:
1815:
1812:
1808:
1807:
1805:
1801:
1798:
1794:
1789:
1785:
1784:
1782:
1778:
1775:
1771:
1766:
1762:
1761:
1759:
1755:
1750:
1746:
1742:
1737:
1734:
1730:
1727:
1723:
1722:
1720:
1716:
1713:
1709:
1706:
1702:
1701:
1699:
1697:
1693:
1686:
1682:
1679:
1675:
1670:
1669:controversies
1666:
1663:
1662:Supreme Court
1659:
1658:
1656:
1652:
1649:
1645:
1642:
1638:
1635:
1631:
1628:
1624:
1621:
1617:
1614:
1610:
1607:
1603:
1600:
1596:
1593:
1589:
1586:
1582:
1576:
1571:
1570:
1568:
1564:
1561:
1557:
1556:
1554:
1552:
1548:
1543:
1536:
1531:
1529:
1524:
1522:
1517:
1516:
1513:
1507:
1503:
1502:
1497:
1490:
1487:
1484:
1481:
1479:
1476:
1474:
1471:
1470:
1450:
1449:nepis.epa.gov
1446:
1440:
1426:
1425:
1419:
1412:
1397:
1393:
1387:
1379:
1375:
1369:
1355:
1351:
1344:
1337:
1333:
1327:
1312:
1308:
1301:
1293:
1287:
1279:
1273:
1266:
1256:
1248:
1242:
1240:
1238:
1229:
1223:
1215:
1209:
1203:
1199:
1195:
1190:
1182:
1176:
1168:
1162:
1154:
1148:
1146:
1139:
1135:
1131:
1126:
1118:
1112:
1104:
1098:
1096:
1087:
1083:
1077:
1063:on 2010-12-10
1062:
1058:
1052:
1037:on 2011-02-02
1036:
1032:
1026:
1017:
1011:
1007:
1003:
998:
984:
980:
973:
959:on 2017-10-20
958:
954:
948:
946:
931:
927:
921:
919:
914:
903:
900:
898:
895:
893:
890:
888:
885:
883:
880:
878:
875:
873:
870:
868:
867:Air pollution
865:
864:
857:
849:
847:
843:
839:
835:
823:
819:
815:
814:
809:
808:
802:
799:
795:
792:
789:
786:
783:
780:
777:
776:
772:
769:
765:
762:
759:
756:
753:
752:
748:
745:
741:
738:
735:
732:
729:
722:
718:
714:
711:
707:
704:
701:
698:
695:
694:
690:
687:
683:
680:
677:
674:
671:
664:
660:
656:
653:
649:
646:
643:
640:
637:
636:
632:
629:
625:
622:
619:
616:
612:
609:
606:
602:
598:
595:
591:
588:
585:
582:
579:
578:
574:
571:
567:
564:
561:
558:
555:
554:
550:
547:
543:
540:
537:
534:
531:
523:
519:
516:
512:
509:
506:
503:
500:
493:
490:
489:
485:
482:
478:
475:
472:
469:
466:
465:
461:
458:
454:
451:
448:
445:
442:
435:
431:
427:
424:
421:
418:
415:
412:
411:
408:
406:
401:
399:
395:
390:
387:
384:
367:
366:cap and trade
359:
358:
357:
356:
318:
317:nitrous oxide
310:
307:
270:
269:Sulfur oxides
267:
259:
256:
253:
250:
241:
238:
230:
229:
228:
225:
218:
215:
214:
208:
204:
201:
198:
197:United States
188:
186:
181:
179:
175:
171:
167:
163:
159:
155:
147:
139:
138:sulfur oxides
135:
131:
119:
111:
107:
103:
98:
96:
95:Clean Air Act
92:
88:
84:
80:
76:
75:
69:
46:, pronounced
45:
41:
32:
19:
4892: /
4766:Exploitation
4651:Conservation
4594:Desalination
4529:
4422:conservation
4257:Biodiversity
4205:conservation
4052:Agricultural
3980:Fossil fuels
3883:
3793:
3728:
3666:Citizen suit
3654:and concepts
3577:
3551:
3317:
3167:
3159:
3137:
3129:
3121:
3113:
3105:
3097:
3089:
3081:
3073:
3065:
3057:
3049:
3041:
3033:
3011:
3003:
2995:
2987:
2979:
2971:
2949:
2941:
2919:
2911:
2903:
2895:
2887:
2879:
2871:
2863:
2855:
2847:
2839:
2831:
2809:
2801:
2793:
2785:
2777:
2769:
2761:
2739:
2731:
2723:
2715:
2707:
2699:
2691:
2628:
2619:
2571:
2549:Enemies List
2375:
2003:War on drugs
1499:
1452:. Retrieved
1448:
1439:
1428:. Retrieved
1421:
1411:
1400:. Retrieved
1398:. 2016-12-29
1395:
1386:
1368:
1357:. Retrieved
1353:
1343:
1326:
1314:. Retrieved
1310:
1300:
1286:
1272:
1255:
1222:
1208:
1189:
1175:
1161:
1125:
1111:
1086:the original
1076:
1065:. Retrieved
1061:the original
1051:
1039:. Retrieved
1035:the original
1025:
1016:
997:
986:. Retrieved
982:
972:
961:. Retrieved
957:the original
933:. Retrieved
929:
855:
841:
837:
831:
811:
739:Annual mean
402:
391:
379:
211:Descriptions
205:
194:
182:
178:fossil fuels
105:
101:
99:
43:
39:
37:
4885:Nationalism
4857:Common-pool
4498:Hydrosphere
4491:remediation
4476:Groundwater
4071:Degradation
3651:Regulations
2598:Resignation
2118:Nixon shock
1719:Vietnam War
1648:Wilson desk
1544:(1969–1974)
1494:‹ The
1311:www.epa.gov
1004:des.nh.gov
798:40 CFR
768:40 CFR
744:40 CFR
710:40 CFR
686:40 CFR
652:40 CFR
628:40 CFR
613:35 ppm (40
594:40 CFR
570:40 CFR
546:40 CFR
515:40 CFR
481:40 CFR
457:40 CFR
383:40 CFR
237:micrometers
170:agriculture
81:that cause
4931:Categories
4880:Extraction
4839:Wilderness
4800:accounting
4783:Management
4749:ecological
4737:tragedy of
4656:Peak water
4641:Efficiency
4614:Sanitation
4556:Stormwater
4549:harvesting
4525:Irrigation
4427:management
4385:gene banks
4326:management
4304:management
4220:resilience
4186:phosphorus
4142:industrial
4120:Management
4096:soundscape
4002:Geothermal
3220:Refuse Act
1560:Transition
1430:2017-06-28
1402:2017-06-28
1359:2018-12-13
1336:Transcript
1067:2010-12-08
1041:2011-02-11
988:2018-01-18
963:2009-10-12
935:2018-03-29
909:References
787:0.15 μg/m
556:Secondary
467:Secondary
364:, using a
191:Background
174:combustion
104:(CAP), or
79:pollutants
4890:Renewable
4875:Depletion
4862:Conflict
4744:Economics
4722:enclosure
4681:Resources
4661:Pollution
4578:Watershed
4481:pollution
4412:Seed bank
4407:Rangeland
4289:Fisheries
4274:Biosphere
4267:biopiracy
4210:fertility
4086:cityscape
4081:Landscape
3988:peak coal
3975:Resources
3926:Emissions
3233:Weeks Act
3227:Lacey Act
3195:decisions
3191:treaties,
2685:decisions
2489:Watergate
1194:Factsheet
1002:Factsheet
504:150 μg/m
413:Pollutant
376:Standards
87:acid rain
38:The U.S.
4916:Category
4849:Resource
4788:adaptive
4686:improved
4646:Conflict
4631:Security
4626:Scarcity
4619:improved
4609:Leaching
4486:recharge
4466:Drinking
4417:Wildlife
4284:Bushmeat
4279:Bushfood
4232:planning
4137:gemstone
4132:Minerals
4113:property
4101:viewshed
4091:seascape
4022:sunlight
3996:peak oil
3992:peak gas
3718:LDV Rule
2498:Timeline
1931:Title IX
1551:Timeline
1496:template
1354:The Hill
1198:Archived
1196:epa.gov
1134:Archived
1006:Archived
860:See also
832:The EPA
820:Source:
754:Primary
638:Primary
610:Primary
586:24-hour
583:35 μg/m
559:15 μg/m
532:Primary
507:24-hour
443:Primary
419:Standard
154:industry
100:The six
4717:Commons
4706:Related
4671:Quality
4587:Aspects
4513:glacial
4454:Aquifer
4360:Pasture
4311:Forests
4237:reserve
4012:Nuclear
3982: (
3938:Trading
3933:Airshed
3358:(1972)
3216:(1899)
1804:Détente
1498:below (
1454:29 July
1316:29 July
760:1-hour
736:annual
702:8-hour
678:1-hour
644:8-hour
620:1-hour
562:annual
538:annual
473:3-hour
449:1-hour
446:75 ppb
369:states.
144:), and
4727:global
4691:policy
4636:Supply
4599:Floods
4566:Sewage
4539:Marine
4531:huerta
4365:Plants
4355:Meadow
4215:health
4193:rights
4181:copper
4159:mining
4057:arable
3957:Energy
3897:Indoor
3803:(2010)
3720:(2010)
3714:(2022)
3708:(2007)
3594:(2022)
3588:(2022)
3574:(2021)
3568:(2018)
3562:(2016)
3548:(2007)
3542:(2005)
3536:(1996)
3525:(1990)
3519:(1990)
3513:(1990)
3507:(1986)
3501:(1986)
3495:(1980)
3489:(1978)
3483:(1977)
3477:(1976)
3471:(1976)
3465:(1976)
3459:(1975)
3453:(1975)
3395:(1973)
3389:(1973)
3383:(1972)
3377:(1972)
3371:(1972)
3346:(1970)
3340:(1970)
3334:(1969)
3328:(1965)
3301:(1961)
3295:(1956)
3289:(1955)
3283:(1954)
3277:(1934)
3271:(1928)
3265:(1924)
3259:(1924)
3253:(1918)
3247:(1913)
3241:(1911)
3235:(1911)
3229:(1900)
3210:(1897)
3204:(1872)
3172:(2021)
3164:(1998)
3151:CERCLA
3142:(2023)
3134:(2020)
3126:(2018)
3118:(2016)
3110:(2013)
3102:(2012)
3094:(2009)
3086:(2009)
3078:(2007)
3070:(2006)
3062:(2006)
3054:(2004)
3046:(2001)
3038:(1985)
3016:(2021)
3008:(2018)
3000:(2007)
2992:(1995)
2984:(1992)
2976:(1978)
2954:(2012)
2946:(1978)
2924:(2022)
2916:(2021)
2908:(2015)
2900:(2014)
2892:(2011)
2884:(2007)
2876:(2007)
2868:(2004)
2860:(2004)
2852:(2001)
2844:(1984)
2836:(1975)
2814:(2010)
2806:(2008)
2798:(2004)
2790:(2004)
2782:(1983)
2774:(1983)
2766:(1973)
2744:(2021)
2736:(2000)
2728:(1990)
2720:(1979)
2712:(1978)
2704:(1972)
2696:(1920)
2605:Pardon
2576:(1974)
2316:policy
1046:US EPA
983:US EPA
877:Asthma
158:mining
136:(CO),
132:(Pb),
4870:Curse
4676:Right
4518:polar
4508:bergs
4471:Fresh
4439:Water
4152:metal
4076:Field
4027:shade
4017:Solar
4007:Hydro
3892:Index
3184:Major
3153:cases
3027:cases
2965:cases
2935:cases
2825:cases
2755:cases
1422:U.S.
1332:Video
822:USEPA
801:50.12
781:(Pb)
771:50.11
747:50.11
713:50.19
663:Ozone
607:(CO)
597:50.18
549:50.18
460:50.17
275:): SO
110:ozone
44:NAAQS
4967:Smog
4805:good
4754:land
4732:land
4544:Rain
4400:wood
4375:food
4338:Game
4249:Life
4200:Soil
4176:peak
4169:sand
4044:Land
4034:Wind
3909:(US)
3886:(US)
3445:2007
3441:2000
3437:1999
3433:1996
3429:1992
3425:1990
3421:1988
3417:1986
3413:1976
3409:1974
2933:RCRA
2753:NEPA
1456:2023
1318:2023
779:Lead
689:50.9
655:50.8
631:50.8
617:/m)
573:50.7
518:50.6
484:50.5
416:Type
252:Lead
183:The
168:and
130:lead
83:smog
74:naks
4604:Law
4503:Ice
4343:law
4321:law
4299:law
4227:Use
4164:law
4147:ore
4108:Law
3984:gas
3970:Law
3965:Bio
3902:Law
3867:Air
3025:CWA
2963:ESA
2823:CAA
2528:CRP
723:(NO
527:2.5
494:(PM
436:(SO
400:."
311:(NO
271:(SO
244:2.5
176:of
148:(NO
140:(SO
128:),
124:/PM
122:2.5
120:(PM
116:),
4933::
3994:,
3990:,
3986:,
3443:,
3439:,
3435:,
3431:,
3427:,
3423:,
3419:,
3415:,
3411:,
1447:.
1420:.
1394:.
1352:.
1334:,
1309:.
1236:^
1144:^
1132:.
1094:^
981:.
944:^
928:.
917:^
813:^a
727:)
669:)
665:(O
615:mg
529:)
498:)
496:10
440:)
407:.
386:50
340:NO
319:(N
242:PM
233:10
231:PM
219:(O
164:,
160:,
156:,
126:10
112:(O
85:,
3998:)
3851:e
3844:t
3837:v
3407:(
3189:,
2666:e
2659:t
2652:v
1743:"
1739:"
1577:"
1573:"
1534:e
1527:t
1520:v
1458:.
1433:.
1405:.
1380:.
1362:.
1320:.
1294:.
1267:.
1261:2
1249:.
1230:.
1183:.
1155:.
1119:.
1105:.
1070:.
1044:.
991:.
966:.
938:.
725:2
667:3
438:2
362:x
351:2
347:x
342:2
337:2
333:x
329:2
325:2
321:2
313:x
305:.
303:2
299:2
295:2
290:2
285:x
281:2
277:x
273:x
262:2
221:3
150:x
142:x
114:3
68:/
65:s
62:k
59:æ
56:n
53:ˈ
50:/
42:(
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.