2017-05-23_GENERAL DOCUMENTS - M1977472

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Table 2. Ambient Air Quality Standards Polldtant Standard Averaging s Level Form [final rule citation] Type Period Carbon Monoxide 8-hour 9 ppma Not to be exceeded more Primary [76 FR 54294,Aug 31,20111 1-hour 35 ppm than once per year Lead Primary and Rolling 3-month 3 Not to be exceeded [73 FR 66964,Nov 12,20081 secondary average 0.15 µg/m Nitrogen Dioxide Primary 1-hour 100 ppb 98th percentile, averaged [75 FR 6474,Feb 9,20101 over 3 years [61 FR 52852,Oct 8,19961 Primary and Annual 53 ppb Annual mean secondary Ozone Annual fourth-highest daily [80 FR 65292, Primary and 8-hour 0.070 ppm maximum 8-hr secondary concentration, averaged Oct 26, 20151 over 3 years Particulate 3 Annual mean, averaged Primary Annual 12 µg/m Matter over 3 years [73 FR 3086,Jan PM2 s Secondary Annual 15 µg/m3 Annual mean, averaged 15,20131 over 3 years Primary and 24 hour 35 µg/m 3 98th percentile, averaged seconds over 3 years Not to be exceeded more Primary and 3 PMlo 24-hour 150 µg/m than once per year on secondary average over 3 years Sulfur Dioxide 99th percentile of 1-hour Primary 1-hour 75 ppb daily maximum [75 FR 35520,Jun 22,20101 concentrations, averaged [38 FR 25678,Sept 14, Secondary 3-hour 0.5 ppm b Not to be exceeded more 1973] 1 1 1 than once per year a mg/m3=milligrams per cubic meter, µg/m3= micrograms per cubic meter, ppb=parts per billion, ppm=parts per million. b Colorado Ambient Air Quality Standard for 3-hour S02 is 0.267 ppm. Source: National—40 CFR 50,Colorado—5 CCR 1001-14 DOI-BLM-CO-N020-2017-0003 13