The demonstration pertaining to maximum allowable increases required under subsection (a)(3) shall not apply to maximum allowable increases for class II areas in the case of an expansion or modification of a major emitting facility which is in existence on August 7, 1977, whose allowable emissions of air pollutants, after compliance with subsection (a)(4), will be less than fifty tons per year and for which the owner or operator of such facility demonstrates that emissions of particulate matter and sulfur oxides will not cause or contribute to ambient air quality levels in excess of the national secondary ambient air quality standard for either of such pollutants.
Any completed permit application under section 7410 of this title for a major emitting facility in any area to which this part applies shall be granted or denied not later than one year after the date of filing of such completed application.
|
Maximum allowable increase (in micrograms per cubic meter) |
---|---|
Particulate matter: |
|
Annual geometric mean |
19 |
Twenty-four-hour maximum |
37 |
Sulfur dioxide: |
|
Annual arithmetic mean |
20 |
Twenty-four-hour maximum |
91 |
Three-hour maximum |
325 |
MAXIMUM ALLOWABLE INCREASE |
||
---|---|---|
(In micrograms per cubic meter) |
||
Period of exposure |
Low terrain areas |
High terrain areas |
24-hr maximum |
36 |
62 |
3-hr maximum |
130 |
221 |