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Theodore Roosevelt
Administrative History |
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APPENDIX E:
AMBIENT AIR QUALITY STANDARDS
| pollutant | federal primary standard |
North Dakota standard |
| total suspended particulates (TSP) | 75 µg/m3 annual geometric mean 260 µg/m3 24-hr. average |
60 µg/m3 annual geometric mean 250 µg/m3 maximum 24-hr. average |
| settled particulates (dustfall) | none | 15 tons/sq. mile, maximum 3-month arithmetic mean in residential areas 30 tons/sq. mile, maximum 3-month arithmetic mean in heavy industrial areas |
| sulfur dioxide | 0.03 ppm (30 µg/m3) annual arithmetic average 0.14 ppm (365 µg/m3) 24-hr. average |
60 µg/m3 (0.02 ppm) maximum annual arithmetic mean 260 µg/m3 (0.10 ppm) maximum 24-hr. concentration 715 µg/m3 (0.24 ppm) maximum 1-hr. concentration |
| reactive sulfur | none | 0.24 mg/100 cm2/day, maximum annual arithmetic mean 0.50 mg/100 cm2/day, maximum for 1-month period |
| suspended sulfate | none | 4 µg/m3 12 µg/m3 maximum annual arithmetic mean; maximum 24-hr. concentration not to be exceeded over 1% of the time 30 µg/m3 maximum 1-hr concentration not to be exceeded over 1% of the time |
| foliar fluoride | none | none |
| sulfuric acid mist, sulfur trioxide, or combination | none | 4 µg/m3 maximum annual arithmetic mean 12 µg/m3 maximum 24-hr. concentration not to be exceeded over 1% of the time 30 µg/m3 maximum 1-hr. concentration not to be exceeded over 1% of the time |
| hydrogen sulfide | none | 45 µg/m3 (0.032 ppm) maximum half-hour concentration not to be exceeded more than twice in any five consecutive days 75 µg/m3 (0.054 ppm) maximum half-hour concentration not to be exceeded more than twice a year |
| carbon monoxide | 9 ppm (10 mg/m3) 8-hr. average* 35 ppm (40 mg/m3) 1-hr. average* |
10 mg/m3 (9 ppm) maximum 3-hr. concentration* 40 mg/m3 (35 ppm) maximum 1-hr. concentration* |
| nitrogen dioxide | 0.05 ppm (100 µg/m3) annual arithmetic average |
100 µg/m3 (0.05 ppm) maximum annual arithmetic mean 200 µg/m3 (0.10 ppm) maximum 1-hr. concentration not to be exceeded over 1% of the time in any 3 months |
| photochemical oxidants (ozone) | 0.12 ppm (235 µg/m3) 1-hr. average* |
235 µg/m3 (0.12 ppm) maximum 1-hr. concentration* |
| hydrocarbons (less methane) | 24 ppm (160 µg/m3) 3-hr. concentration (6-9 AM)* |
160 µg/m3 (0.24) ppm maximum 3-hr. concentration (6-9 AM)* |
| lead | 1.5 µg/m3 calendar quarter average |
1.5 µg/m3 quarterly arithmetic mean |
| visibility | none | 0.4 coefficient of haze per 100 linear feet maximum annual geometric mean (coefficient of haze) |
abbreviations:
* not to be exceeded more than once per yearµg = micrograms
m = cubic meter
mg = milligrams
ppm = parts per million
cm2 = square centimeter(s)
SOURCES: National Ambient Air Quality Standards 1978
North Dakota Air Pollution Regulations 1978
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Last Updated: 15-Jan-2004