9 Va. Admin. Code § 5-80-1635

Current through Register Vol. 41, No. 6, November 4, 2024

Section 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.

9 Va. Admin. Code § 5-80-1635

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

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.