About Us	National Ambient Air Quality Standards
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	The U.S. Environmental Protection Agency (EPA) has set forth standards for a set of pollutants that it refers to as the criteria pollutants.  These standards are basically designed to protect human health and welfare with an adequate margin of safety.
	National Ambient Air Quality Standards for Criteria Pollutants
	Pollutant  Averaging Period  Standard Carbon Monoxide  8 hours 9  ppm   1 hour  35  ppm Nitrogen Dioxide  Annual 100  µ/m3 Ozone  8 hours  0.075  ppm Lead  Quarter Year 1.5  µ/m3 PM10  24 hours 150  µ/m3 PM2.5 Annual 15  µ/m3   24 hours  35  µ/m3 Sulfur Dioxide  Annual 80  µ/m3   24 hours  365  µ/m3   3 hours  1300  µ/m3
	Most State have standards that are identical to the NAAQS.  However, some states choose to maintain a different set of standards.  In addition to the NAAQS pollutants, State agencies often maintain their own standards for a variety of toxic air pollutants.   Air & Noise Compliance can assist businesses in determining applicability of NAAQS and toxic air pollutant standards.