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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  /m3
Ozone 
8 hours 
0.075  ppm
Lead 
Quarter Year
1.5  /m3
PM10 
24 hours
150  /m3
PM2.5
Annual
15  /m3
 
24 hours 
35  /m3
Sulfur Dioxide 
Annual
80  /m3
 
24 hours 
365  /m3
 
3 hours 
1300  /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.