North Dakota Administrative Code › Title 33.1 - Department of Environmental Quality › Article 33.1-15 - Air Pollution Control › Chapter 33.1-15-02 - Ambient Air Quality Standards › Table 1 - AMBIENT AIR QUALITY STANDARDS

Current through Supplement No. 393, July, 2024
Air Contaminants
Standards (Maximum Permissible
								Concentrations)
Inhalable
Particulates
PM10
150 micrograms per cubic meter, 24-hour average
								concentration. The standard is attained when the expected number of days per
								calendar year with a 24-hour average concentration above 150 micrograms per
								cubic meter, as determined in accordance with 40 CFR 50, Appendix K, is equal
								to or less than one.
PM2.5
12.0 micrograms per cubic meter annual arithmetic
								mean concentration. The standard is met when the
3-year average of
								the
annual arithmetic mean concentration, as determined in
								accordance with 40 CFR 50, Appendix N, is less than or equal to 12.0 micrograms
								per cubic meter.
35 micrograms per cubic meter 24-hour average
								concentration. The standard is met when the
3-year average of the
								annual
98th percentile 24-hour
								concentration, as determined in accordance with 40 CFR 50, Appendix N, is less
								than or equal to 35 micrograms per cubic meter.
Sulfur Dioxide
0.075 parts per million (196 micrograms per cubic
								meter) 1-hour average concentration. The standard is met when the 3-year
								average of the annual 99th percentile of the daily
								maximum 1-hour average concentration is less than or equal to 0.075 parts per
								million, as determined in accordance with 40 CFR 50, Appendix T.
0.5 parts per million (1,309 micrograms per cubic
								meter of air) maximum 3-hour concentration, not to be exceeded more than once
								per calendar year.
Hydrogen Sulfide
10.0 parts per million (14 milligrams per cubic
								meter of air), maximum instantaneous (ceiling) concentration not to be
								exceeded.
0.20 parts per million (280 micrograms per cubic
								meter of air), maximum 1-hour average concentration not to be exceeded more
								than once per month.
0.10 parts per million (140 micrograms per cubic
								meter of air), maximum 24-hour average concentration not to be exceeded more
								than once per year.
0.02 parts per million (28 micrograms per cubic
								meter of air), maximum arithmetic mean concentration averaged over three
								consecutive
Carbon Monoxide
9 parts per million (10 milligrams per cubic meter
								of air), maximum 8-hour concentration not to be exceeded more than once per
								year.
35 parts per million (40 milligrams per cubic meter
								of air), maximum 1-hour concentration not to be exceeded more than once per
								year.
Ozone
0.070 parts per million (137 micrograms per cubic
								meter of air) daily maximum 8-hour average concentration. The standard is met
								when the 3-year average of the annual fourth-highest daily maximum 8-hour
								average concentration at an ambient air quality monitoring site is less than or
								equal to 0.075
0.070
ppm, as determined in accordance
								with 40 CFR 50, Appendix P.
Nitrogen Dioxide
0.053 parts per million (100 micrograms per cubic
								meter of air), maximum annual arithmetic mean.
0.100 parts per million (188 micrograms per cubic
								meter) 1-hour average concentration. The standard is met when the 3-year
								average of the annual 98th percentile of the daily
								maximum 1-hour average concentration is less than or equal to 0.100 parts per
								million, as determined in accordance with 40 CFR 50, Appendix S.
Lead
0.15 micrograms per cubic meter of air, arithmetic
								mean averaged over a 3-month rolling period. The standard is met when the
								maximum 3-month mean concentration for a 3-year period, as determined in
								accordance with 40 CFR 50, Appendix R, is less than or equal to 0.15 micrograms
								per cubic meter.