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criteria air contaminants
Criteria air contaminants (CAC), or criteria pollutants, are a set of air pollutants that cause smog, acid rain, and other health hazards. CACs are typically emitted from many sources in industry, mining, transportation, electricity generation and agriculture. In most cases they are the products of the combustion of fossil fuels or industrial processes.〔http://des.nh.gov/organization/commissioner/pip/factsheets/ard/documents/ard-41.pdf〕
The history of each criteria air pollutant is listed below:
==Background==
The six criteria air contaminants were the first set of pollutants recognized by the United States Environmental Protection Agency as needing standards on a national level.〔Michigan Department Of Environmental Quality, January 2004. What is an Air Contaminant Pollutant? Fact Sheet〕 The Clean Air Act requires the EPA to set US National Ambient Air Quality Standards (NAAQS) for the six CACs.〔http://epa.gov/air/criteria.html US EPA〕 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 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.〔http://www.epa.gov/air/criteria.html〕
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