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Table 2-1. Ambient Air Quality Standards Applicable in California <br /> Standard <br /> Standard (micrograms <br /> (parts per million) per cubic meter) Violation Criteria <br /> Pollutant Symbol Average Time California National California National California National <br /> Ozone 0, 1 hour 0.09 0.12 180 235 If exceeded If exceeded on more than 1 day per year <br /> 8 hours 0.07 0.08 NA 157 If exceeded If fourth-highest 8-hour concentration in <br /> a year,averaged over 3 years,is exceeded <br /> at each monitor within an area <br /> Carbon monoxide CO 8 hours 9 9 10,000 10,000 If exceeded If exceeded on more than 1 day per year <br /> I hour 20 35 23,000 40,000 If exceeded If exceeded on more than I day per year <br /> (Lake Tahoe only) 8 hours 6 NA 7,000 NA If equaled or exceeded NA <br /> Nitrogen dioxide NO, Annual average NA 0.053 NA 100 NA If exceeded on more than l day per year <br /> 1 hour 0.25 NA 470 NA If exceeded NA <br /> Sulfur dioxide SOZ Annual average NA 0.03 NA 80 NA If exceeded <br /> 24 hours 0.04 0.14 105 365 If exceeded If exceeded on more than 1 day per year <br /> 1 hour 0.25 NA 655 NA If exceeded NA <br /> Hydrogen sulfide H,S 1 hour 0.03 NA 42 NA If equaled or exceeded NA <br /> Vinyl chloride C,H,CI 24 hours 0.01 NA 26 NA If equaled or exceeded NA <br /> Inhalable PM10 Annual geometric mean NA NA 20 NA If exceeded NA <br /> particulate matter Annual arithmetic mean NA NA NA 50 NA If exceeded at each monitor within area <br /> 24 hours NA NA 50 150 If exceeded If exceeded on more than 1 day per year <br /> PM2 5 Annual geometric mean NA NA NA NA If exceeded NA <br /> Annual arithmetic mean NA NA 12 15 NA If 3-year average from single or multiple <br /> community-oriented monitors is exceeded <br /> 24 hours NA NA NA 65 NA If 3-year average of 98`h percentile at <br /> each population-oriented monitor within <br /> an area is exceeded <br /> Sulfate particles SO, 24 hours NA NA 25 NA If equaled or exceeded NA <br /> Lead particles Pb Calendar quarter NA NA NA 1.5 NA If exceeded no more than 1 day per year <br /> 30-day average NA NA 1.5 NA If equaled or exceeded NA <br /> Notes: All standards are based on measurements at 25°C and I atmosphere pressure. <br /> National standards shown are the primary(health effects)standards. <br /> NA=not applicable. <br /> Source: California Air Resources Board 2003 <br />