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Contains Unit of measure Standard
CO second highest daily hourly (8-hour) maximum annually ppm 9 ppm
CO second highest daily hourly (1-hour) maximum annually ppm 9 ppm
lead (Pb) rolling quarterly maximum µg/m3 .15 µg/m3
NO2 highest annual mean concentration ppm 0.053 ppm
O3 fourth highest daily 8-hourly maximum over the ozone season ppm 0.075 ppm
PM10 second highest daily hourly (8-hourly) maximum annually µg/m3 150 µg/m3
PM 2.5 24-hour, 98th percentile (of 24-hour PM2.5 concentrations in a year (averaged over 3 years), at the population-oriented monitoring site with the highest measured values in an area) µg/m3 15 µg/m3
PM 2.5 weighted annual mean µg/m3 35 µg/m3
SO2 second highest daily hourly (24-hourly) maximum annually ppm 0.03 ppm
SO2 highest arithmetic annual mean concentration ppm 0.14 ppm