DIVISION 200
GENERAL AIR POLLUTION PROCEDURES AND DEFINITIONS
340-200-8005
Table 1 Significant Impact Levels
As used in divisions 200, 209, and 225, Table 1 Significant Impact Levels refers to the table below.
Table 1 Significant Impact Levels
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Pollutant | Averaging Time | Air Quality Area Designation | |||
Class I | Class II | Class III | |||
SO2 (µg/m3)1 | Annual | 0.10 | 1.0 | 1.0 | |
24-hour | 0.20 | 5.9 | 5.0 | ||
3-hour | 1.0 | 25.0 | 25.0 | ||
PM10 (µg/m3) | Annual | 0.20 | 0.20 | 0.20 | |
24-hour | 0.30 | 1.0 | 1.0 | ||
PM2.5 (µg/m3) | Annual | 0.06 | 0.3 | 0.3 | |
24-hour | 0.07 | 1.2 | 1.2 | ||
NO2 (µg/m3) | Annual | 0.10 | 1.0 | 1.0 | |
CO (mg/m3)2 | 8-hour | --- | 0.5 | 0.5 | |
1-hour | --- | 2.0 | 2.0 | ||
[ED. NOTE: This rule amended and renumbered from OAR 340-200-0020.]
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