Criteria Pollutants: The 1970 amendments to the Clean Air Act required EPA to set National Ambient Air Quality Standards for certain pollutants known to be hazardous to human health.
Criteria pollutants
Air pollutants for which standards for safe levels of exposure have been set under the Clean Air Act. Current criteria pollutants are sulfur dioxide, particulate matter, carbon monoxide, nitrogen oxides, ozone and lead.
Criteria Pollutants set standards to protect human health and welfare for six pollutants ...
criteria pollutants Pollutants known to be hazardous to human health. The term derives from the requirement to describe the characteristics and potential health and welfare effects of these pollutants from which standards are set or revised.
(See Criteria Pollutants and National Ambient Air Quality Standards.)
Source: Terms of the Environment
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Like the PSI, the AQI incorporates five criteria pollutants -- ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide -- into a single index. The new index also incorporates the 8-hour ozone standard and the 24-hour PM2.
Ambient Air Quality Standards: See Criteria Pollutants and National Ambient Air Quality Standards.
The term "criteria pollutants" derives from the requirement that the EPA must describe the characteristics and potential health and welfare effects of these pollutants.
Non-attainment area
Area that does not meet one or more of the National Ambient Air Quality Standards for the criteria pollutants designated in the Clean Air Act.(1)
Oral toxicity
Ability of a pesticide to cause injury when ingested.(1) ...
National Ambient Air Quality Standards (NAAQS): Standards established by EPA that apply for outdoor air throughout the country. (See: criteria pollutants, state implementation plans, emissions trading.) ...
It can seriously impair the respiratory system and is one of the most wide- spread of all the criteria pollutants for which the Clean Air Act required EPA to set standards.
A geographic area in which the level of a criteria air pollutant is higher than the level allowed by the federal standards (i.e., does not meet one or more of the NAAQS for the criteria pollutants).
Non-Aqueous Phase Liquid ...
 See also: Pollutant, Standards, Criteria, Air, National
  
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