GroundRules
9VAC5-80-1635: Ambient air increments
Where this section sits in the code
- Title 9. Environment
- Agency 5. State Air Pollution Control Board
- Chapter 80. Permits for Stationary Sources
- Part II. Permit Procedures
- Article 8. Permits for Major Stationary Sources and Major Modifications Locating in Prevention of Significant Deterioration Areas
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.
Collected 2026-09-14T04:48:37Z. Source file · JSON