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Introduction-APCD - What are the Pollutants Reading Chap...

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9/13/11 Aerosol & Particulate 11 What are the Pollutants? National Ambient Air Quality Standards (NAAQS) Primary pollutant : emitted directly Secondary pollutant : formed by chemical reactions among primary pollutants *VOC: Volatile Organic Compound; 1health related; 2welfare related Reading: Chap 1.1-1.4, 1.8- 1.9 Pollutant Average Time Primary Standard1 Secondary Standard2 PM10 24-hour 150 µg/m3 Same as Primary PM2.5 Annual 15 µg/m3 Same as Primary 24-hour 35 µg/m3 Same as Primary SO2 Annual 0.03 ppmv 24-hour 0.14 ppmv 1-hour 75 ppb (2010 std) 3-hour 0.5 ppm (1300 µg/m3) NO2 Annual 0.053 ppmv (100 µg/m3) Same as Primary 1-hour 0.1 ppmv (2010 std) None CO 8-hour 9 ppmv (10 mg/m3) None 1-hour 35 ppmv (40 mg/m3) None O3 8-hour 0.075 ppmv (2008 std) Same as Primary 8-hour 0.08 ppmv (1997 std) Same as Primary 1-hour 0.12 ppmv Same as Primary Pb Rolling 3-month average 0.15 µg/m3 (2008 std) Same as Primary Quarterly average 1.5 µg/m3 Same as Primary
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9/13/11 Aerosol & Particulate 22 Air Pollution Index (API) / Pollutants Standard Index (PSI) Segmented linear function connected by straight lines Overall API is the maximum of all the sub-index values API Value Air Quality Descriptor 0-50 Good 51-100 Moderate 101-199 Unhealthful 200-299 Very unhealthful 9 300 Hazardous http://airnow.gov/index.cfm?action=airnow.national
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