Theodore Roosevelt
At the Open Margin:
The NPS's Administration of Theodore Roosevelt National Park
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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 year
µg = 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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thro/adhi/appe.htm
Last Updated: 15-Jan-2004