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APPENDIX B 204 APPENDIX B NATIONAL AMBIENT AIR QUALITY STANDARDS TABLE B-1 Current National Ambient Air Quality Standardsa Pollutant Concentration Comments Sulfur dioxide (SO2) 80 µg/m3 (0.03 ppm) Annual arithmetic mean 365 µg/m3 (0.14 ppm) Maximum 24-hour concentration not to be exceeded more than once per year Total suspended 75 µg/m3 Annual geometric mean particulates (TSP) 260 µg/m3 Maximum 24-hour concentration not to be exceeded more than once per year Carbon monoxide (CO) 10 mg/m3 (9 ppm) Maximum 8-hour concentration not to be exceeded more than once per year 40 mg/m3 (35 ppm) Maximum 1-hour concentration not to be exceeded more than once per year Ozone (O3) 235 µg/m3 (0.12 ppm) Not more than one day per calendar year with maximum hourly average concentrations above 235 µg/ m3 Nitrogen dioxide (NO2) 100 µg/m3 (0.05 ppm) Annual arithmetic mean (generally monitored continuously) Lead 1.5 µg/m3 Maximum arithmetic mean averaged over a calendar quarter (frequently monitored weekly) a Reprinted from Code of Federal Regulations, Title 40, Part 50, 1984.
