National Ambient Air Quality Standards: Difference between revisions
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[[File:US-overall-nonattainment-2007-06.png|thumb|300px|Counties in the United States where one or more '''National Ambient Air Quality Standards''' are not met, as of June 2007]] |
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The '''National Ambient Air Quality Standards''' ('''NAAQS''') are standards established by the [[United States]] [[United States Environmental Protection Agency|Environmental Protection Agency]] under authority of the [[Clean Air Act (United States)|Clean Air Act]] (42 U.S.C. 7401 et seq.) that apply for outdoor air throughout the country. 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 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".<ref>[http://tapseis.anl.gov/glossacro/dsp_wordpopup.cfm?word_id=444 Trans-Alaska Pipeline System Renewal Environmental Impact Statement article]</ref> |
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==Standards== |
==Standards== |
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The standards are listed in {{USCFR|40|50}}. |
The standards are listed in {{USCFR|40|50}}. |
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| [[Particulate matter#Health effects|PM<sub>2.5</sub>]] |
| [[Particulate matter#Health effects|PM<sub>2.5</sub>]] |
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| Primary and Secondary |
| Primary and Secondary |
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| 35 μg/m³ |
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| 24-hour |
| 24-hour |
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| {{USCFR|40|50|7|a}} |
| {{USCFR|40|50|7|a}} |
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|- |
|- |
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| PM<sub>2.5</sub> |
| PM<sub>2.5</sub> |
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| Primary |
| Primary |
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| 12 μg/m³ |
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| annual |
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| {{USCFR|40|50|7|a}} |
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|- |
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| PM<sub>2.5</sub> |
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| Secondary |
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| 15 μg/m³ |
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| annual |
| annual |
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| {{USCFR|40|50|7|a}} |
| {{USCFR|40|50|7|a}} |
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*{{note|a|a}}Each standard has its own criteria for how many times it may be exceeded, in some cases using a three year average. |
*{{note|a|a}}Each standard has its own criteria for how many times it may be exceeded, in some cases using a three year average. |
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*{{note|b|b}}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). |
*{{note|b|b}}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). |
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*{{note|c|c}}As of December 2014, the primary fine particulate standard will be 12.0 μg/m³.<ref>http://www.epa.gov/pm/2012/decfsoverview.pdf</ref> |
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*Source: [http://epa.gov/air/criteria.html USEPA] |
*Source: [http://epa.gov/air/criteria.html USEPA] |
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==Air quality control region== |
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An air quality control region is an area, designated by the federal government, where communities share a common air pollution problem. |
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<ref>{{cite web|title=EPA document|url=http://nepis.epa.gov/Exe/ZyNET.exe/P10053PA.TXT?ZyActionD=ZyDocument&Client=EPA&Index=Prior+to+1976&Docs=&Query=AP102%20or%20f&Time=&EndTime=&SearchMethod=1&TocRestrict=n&Toc=&TocEntry=&QField=pubnumber^%22AP102%22&QFieldYear=&QFieldMonth=&QFieldDay=&UseQField=pubnumber&IntQFieldOp=1&ExtQFieldOp=1&XmlQuery=&File=D:\zyfiles\Index%20Data\70thru75\Txt\00000006\P10053PA.txt&User=ANONYMOUS&Password=anonymous&SortMethod=h%7C-&MaximumDocuments=10&FuzzyDegree=0&ImageQuality=r75g8/r75g8/x150y150g16/i425&Display=p%7Cf&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActionS&BackDesc=Results%20page&MaximumPages=1&ZyEntry=1&SeekPage=x&ZyPURL}}</ref> |
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==See also== |
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* [[Air pollution]] |
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* [[Air Quality Index]] |
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* [[Asthma]] |
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* [[Atmospheric dispersion modeling]] |
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* [[Clean Air Act (1990)]] |
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* [[Portable Emissions Measurement System]] |
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* [[Toxic Substances Control Act of 1976]] |
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==References== |
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{{Reflist}} |
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== External links == |
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* [http://www.epa.gov/ttn/naaqs/ EPA summary of the National Ambient Air Quality Standards] |
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* [http://www.epa.gov/air/criteria.html EPA summary for Air & Radiation] |
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* [http://www.epa.gov/oar/oaqps/greenbk/ EPA Green Book] showing non-attainment, maintenance, and attainment areas |
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* [http://lungaction.org/reports/sota05_cities.html Most Polluted Cities, 2005] – American Lung Association |
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{{US Environmental law}} |
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{{Natural resources}} |
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[[Category:Air pollution in the United States]] |
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[[Category:United States Environmental Protection Agency]] |
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[[Category:Environmental law in the United States]] |
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[[Category:Natural resource management]] |
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Revision as of 15:53, 19 October 2015
Standards
The standards are listed in 40 CFR 50.
| Pollutant | Type | Standard | Averaging Timea | Regulatory Citation |
|---|---|---|---|---|
| SO2 | Primary | 75 ppb | 1-hour | 40 CFR 50.4 |
| SO2 | Secondary | 0.5 ppm (1,300 μg/m³) | 3-hour | 40 CFR 50.5 |
| PM10 | Primary and Secondary | 150 μg/m³ | 24-hour | 40 CFR 50.6 |
| PM2.5 | Primary and Secondary | 35 μg/m³ | 24-hour | 40 CFR 50.7 |
| PM2.5 | Primary | 12 μg/m³ | annual | 40 CFR 50.7 |
| PM2.5 | Secondary | 15 μg/m³ | annual | 40 CFR 50.7 |
| CO | Primary | 35 ppm (40 mg/m³) | 1-hour | 40 CFR 50.8 |
| CO | Primary | 9 ppm (10 mg/m³) | 8-hour | 40 CFR 50.8(a)(1) |
| O3 | Primary and Secondary | 0.12 ppm (235 μg/m³) | 1-hourb | 40 CFR 50.9(a) |
| O3 | Primary and Secondary | 0.075 ppm (150 μg/m³) | 8-hour | 40 CFR 50.10(a) |
| NOx | Primary and Secondary | 0.053 ppm (100 μg/m³) | annual | 40 CFR 50.11(a) and (b) |
| Pb | Primary and Secondary | 0.15 μg/m³ | Rolling 3 months | 40 CFR 50.12 |
- ^a Each standard has its own criteria for how many times it may be exceeded, in some cases using a three year average.
- ^b 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).
- Source: USEPA