Section 18 AAC 50.010 - Ambient air quality standardsThe standards for concentrations of air pollutants in the ambient air, measured, determined, or predicted by an analytical method described in 18 AAC 50.035 or 18 AAC 50.215, are established as follows:
(1) for particulate matter, as follows: (A) for PM-10: a 24-hour average of L50 micrograms per cubic meter, with this standard being attained when the expected number of days in a calendar year with a 24-hour average concentration above 150 micrograms per cubic meter, as determined in accordance with 40 C.F.R. Part 50, Appendix K, adopted by reference in 18 AAC 50.035(b), is less than or equal to one;(B) for PM-2.5: (i) an annual arithmetic mean concentration of 12.0 micrograms per cubic meter, with this standard being attained when the three-year average of the annual arithmetic mean concentration is less than or equal to 12.0 micrograms per cubic meter; for purposes of this sub-subparagraph, a figure must be rounded to the nearest.1 microgram per cubic meter, as required in 40 C.F.R. Part 50, Appendix N, sec. 4.3(a), adopted by reference in 18 AAC 50.035(b);(ii) a 24-hour average concentration of 35 micrograms per cubic meter, with this standard being attained when the three-year average of the annual 98th percentile 24-hour concentration is less than or equal to 35 micrograms per cubic meter; for purposes of this sub-subparagraph, a figure must be rounded to the nearest one microgram per cubic meter, as required in 40 C.F.R. Part 50, Appendix N, sec. 4.3(b), adopted by reference in 18 AAC 50.035(b);(2) for sulfur oxides, measured as sulfur dioxide:(A) annual arithmetic mean of 80 micrograms per cubic meter;(B) 24-hour average of 365 micrograms per cubic meter not to be exceeded more than once each year; and(C) three-hour average of 1300 micrograms per cubic meter not to be exceeded more than once each year;(D) one-hour average sulfur dioxide concentration of 196 micrograms per cubic meter, with this standard being attained when the three-year average of the annual, 99th percentile, daily maximum, one-hour sulfur dioxide concentration is less than or equal to 196 micrograms per cubic meter, as determined in accordance with 40 C.F.R. Part 50, Appendix T, adopted by reference in 18 AAC 50.035(b);(3) for carbon monoxide: (A) eight-hour average of 10 milligrams per cubic meter not to be exceeded more than once each year; and(B) one-hour average of 40 milligrams per cubic meter not to be exceeded more than once each year;(4) for ozone: a daily maximum eight-hour average of .070 parts per million, with this standard being attained when the three-year average of the annual fourth-highest daily maximum eight-hour average ozone concentration is less than or equal to .070 parts per million;(5) for oxides of nitrogen, measured as nitrogen dioxide:(A) annual average nitrogen dioxide concentration of 100 micrograms per cubic meter, with this standard being attained when the average of the one-hour nitrogen dioxide concentrations in a calendar year is less than or equal to 100 micrograms per cubic meter, as determined in accordance with 40 C.F.R. Part 50, Appendix S, adopted by reference in 18 AAC 50.035(b);(B) one-hour average nitrogen dioxide concentration of 188 micrograms per cubic meter, with this standard being attained when the three-year average of the annual, 98th percentile, daily maximum, one-hour nitrogen dioxide concentration is less than or equal to 188 micrograms per cubic meter, as determined in accordance with 40 C.F.R. Part 50, Appendix S, adopted by reference in 18 AAC 50.035(b);(6) for lead: an arithmetic mean concentration over a three-month period of.15 micrograms per cubic meter, with this standard being attained when the maximum arithmetic three-month mean concentration for a three-year period is less than or equal to.15 micrograms per cubic meter;(7) repealed 8/20/2016; and(8) for ammonia: 2.1 milligrams per cubic meter, averaged over any consecutive eight hours not to be exceeded more than once each year.Eff. 1/18/97, Register 141; am 6/21/98, Register 146; am 10/1/2004, Register 171; am 4/1/2010, Register 193; am 9/17/2011, Register 199; am 1/4/2013, Register 205; am 4/17/2015, Register 214, July 2015; am 3/2/2016, Register 217, April 2016; am 8/20/2016, Register 219, October 2016Authority:AS 46.03.020
AS 46.14.010
AS 46.14.030
Sec. 30, ch. 74, SLA 1993