Current through February 27, 2024
The 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.
Authority:AS
46.03.020
AS 46.14.010
AS 46.14.030
Sec. 30, ch. 74, SLA
1993
