N.Y. Comp. Codes R. & Regs. tit. 6, § 231-12.6
For the purposes of Subparts 231-5 and 231-6 of this Part, a new or modified facility will be considered to cause or contribute to a violation of a national ambient air quality standard when such new or modified facility would, at a minimum, exceed the following significant impact levels (SILs) at any locality that does not or would not meet the applicable national standard:
| Short Term Averaging Times (hours) | |||||
|---|---|---|---|---|---|
| Regulated NSR Contaminant | Annual Average | 24 | 8 | 3 | 1 |
| SO2 | 1.0 µg/m3 | 5 µg/m3 | 25 µg/m3 | 7.8 μg/m3 | |
| PM-10 | 1.0 µg/m3 | 5 µg/m3 | |||
| PM-2.5 | 0.3 µg/m3 | 1.2 µg/m3 | |||
| NOx* | 1.0 µg/m3 | 7.5 μg/m3 | |||
| CO | 500 µg/m3 | 2000 µg/m3 |
* For the purposes of this table, NO2 shall be the subset of NOx that is modeled