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Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 80. Permits for Stationary Sources
11/13/2019

9VAC5-80-1635. Ambient Air Increments.

In areas designated as class I, II or III, increases in pollutant concentration over the baseline concentration shall be limited to the following:

MAXIMUM ALLOWABLE INCREASE
(micrograms per cubic meter)

Class I Area

PM2.5:

Annual arithmetic mean

1

24 hour maximum

2

PM10:

Annual arithmetic mean

4

24 hour maximum

8

Sulfur dioxide:

Annual arithmetic mean

2

24-hour maximum

5

Three-hour maximum

25

Nitrogen dioxide:

Annual arithmetic mean

2.5

Class II Area

PM2.5:

Annual arithmetic mean

4

24 hour maximum

9

PM10:

Annual arithmetic mean

17

24 hour maximum

30

Sulfur dioxide:

Annual arithmetic mean

20

24-hour maximum

91

Three-hour maximum

512

Nitrogen dioxide:

Annual arithmetic mean

25

Class III Area

PM2.5:

Annual arithmetic mean

8

24 hour maximum

18

PM10:

Annual arithmetic mean

34

24 hour maximum

60

Sulfur dioxide:

Annual arithmetic mean

40

24-hour maximum

182

Three-hour maximum

700

Nitrogen dioxide:

Annual arithmetic mean

50

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.

Statutory Authority

§ 10.1-1308 of the Code of Virginia; Clean Air Act (§§ 110, 112, 165, 173, and 182 and Title V); 40 CFR Parts 51, 61, 63, 70 and 72.

Historical Notes

Derived from Volume 22, Issue 23, eff. September 1, 2006; amended, Virginia Register Volume 27, Issue 23, eff. August 17, 2011.

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