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| | Mid-Atlantic Air Quality (Site not responding. Last check: 2007-11-04) |
 | | EPA uses six "criteria pollutants" as indicators of air quality: ozone, carbon monoxide, nitrogen dioxide, sulfur dioxide, particulate matter and lead. |
 | | For each of these, EPA has established "primary" standards to protect public health, and "secondary" standards to protect other aspects of public welfare, such as preventing materials damage, preventing crop and vegetation damage, or assuring visibility. |
 | | In addition, EPA has issued an Air Quality Index which gives citizens critical Information to take necessary health precautions. |
| www.epa.gov /reg3artd/airquality/airquality.htm (341 words) |
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