Alaska Administrative Code › Title 18 - Environmental Conservation › Chapter 50 - Air Quality Control › Article 1 - Ambient Air Quality Management › 18 AAC 50.020 - Baseline dates and maximum allowable increases

Current through May 31, 2024
(a) In an area
				designated nonattainment in
				18 AAC 50.015(b),
				the provisions of this section do not apply to the nonattainment air pollutant.
				However, this section does apply to all other air pollutants listed in Table 2
				in this subsection.
Table 2 Baseline Areas and Dates.
Baseline Area
Air Pollutant
Minor Source Baseline Date
Cook Inlet Intrastate Air Quality Control
						  Region
Nitrogen dioxide
February 8, 1988
Sulfur dioxide
October 12, 1979
PM-10
March 20, 1982
PM-2.5
September 14, 2012
Northern Alaska Intrastate Air Quality
						  Control Region
Nitrogen dioxide
February 8, 1988
Sulfur dioxide
June 1, 1979
PM-10
November 13, 1978
PM-2.5
November 2, 2012
South Central Alaska Intraslate Air Quality
						  Control Region
Nitrogen dioxide
February 8, 1988
Sulfur dioxide
October 26, 1979
PM-10
October 26, 1979
PM-2.5
October 15, 2015
South Central Alaska Intraslate Air Quality
						  Control Region
Nitrogen dioxide
February 8, 1988
Sulfur dioxide
November 10, 1986
PM-10
To be established under
						  40
						  C.F.R.52.21(b) (14)(ii),
						  adopted by reference in
						  18 AAC 50.040(h)
PM-2.5
To be established under
						  40 C.F.R.
						  52.21(b)(14)(ii), adopted by
						  reference in
						  18 AAC 50.040(h)
(b)
				To establish standards for the prevention of significant deterioration of air
				quality,
(1) minor source baseline dates for
				determining the ambient concentration of certain air pollutants are established
				for each baseline area listed in Table 2 in (a) of this section;
(2) in areas designated as Class I, II, or
				III, increases in air pollutant concentration over the baseline concentration
				shall be limited to the concentrations in Table 3 in this subsection;
(3) for any period other than an annual
				period, the applicable maximum allowable increase may be exceeded during one
				such period per year at any one location;
(4) the baseline concentrations and maximum
				allowable increases shall be measured or predicted by a method described in
				18 AAC 50.215; and
(5) a concentration may not exceed the
				ambient air quality standard described in
				18 AAC 50.010 for that pollutant.
Table 3
Maximum Allowable Increases
Classification of area
in 18 AAC 50.015(c)
Table 1Air PollutantMaximum allowable
increase (micrograms
per cubic meter)CLASS 1PM-10:Annual arithmetic mean . . . .
				  . . . . . . 424-hour maximum . . . . . . . . . . 8Sulfur dioxide:Annual
				  arithmetic mean . . . . . . . . . . 224-hour maximum . . . . . . . . . .
				  53-hour maximum . . . . . . . . . . 25Nitrogen dioxide:Annual arithmetic mean .
				  . . . . . . . . . 2.5PM-2.5:Annual arithmetic mean . . . . . . . . . . 124-hour
				  maximum . . . . . . . . . . 2 CLASS IIPM-10:Annual arithmetic mean . . . . . .
				  . . . . 1724-hour maximum . . . . . . . . . . 30Sulfur dioxide:Annual
				  arithmetic mean . . . . . . . . . . 2024-hour maximum . . . . . . . . . .
				  913-hour maximum . . . . . . . . . . 512 Nitrogen dioxide:Annual arithmetic
				  mean . . . . . . . . . . 25PM-2.5:Annual arithmetic mean . . . . . . . . . .
				  424-hour maximum . . . . . . . . . . 9 CLASS IIIPM-10:Annual arithmetic mean .
				  . . . . . . . . . 3424-hour maximum . . . . . . . . . . 60Sulfur dioxide:Annual
				  arithmetic mean . . . . . . . . . . 4024-hour maximum . . . . . . . . . .
				  1823-hour maximum . . . . . . . . . . 700Nitrogen dioxide:Annual arithmetic
				  mean . . . . . . . . . . 50PM-2.5:Annual arithmetic mean . . . . . . . . . .
				  824-hour maximum . . . . . . . . . . 18