N.D. Admin. Code tit. 33.1, art. 33.1-15, ch. 33.1-15-02, tbl. 1

Current through Supplement No. 394, October, 2024

Table 1 - AMBIENT AIR QUALITY STANDARDS

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.
PM_2.5	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 98^th 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 99^th 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 0.0750.070 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 98^th 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.

N.D. Admin Code tit. 33.1, art. 33.1-15, ch. 33.1-15-02, tbl. 1

Adopted by Administrative Rules Supplement 370, October 2018, effective 1/1/2019.

Amended by Administrative Rules Supplement 371, January 2019, effective 1/1/2019.

Amended by Administrative Rules Supplement 2020-377, July 2020, effective 7/1/2020.