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