IMPERIAL COUNTY AIR POLLUTION CONTROL DISTRICT
RULE 602 - EPISODE CRITERIA LEVELS
(Last revised or adopted prior to October 15, 1979)
|
AVERAGE TIME |
STAGE 1 (Health Advisory Alert) |
STAGE 2 (Warning) |
STAGE 3 (Emergency) |
|
|
Photochemical Oxidant (including Ozone) |
1 hour |
.20 ppm |
.35 ppm |
.50 ppm for 1 hour* |
|
|
1 hour |
40 ppm |
75 ppm |
100 ppm for 1 hour* |
|
12 hours |
20 ppm |
35 ppm |
50 ppm |
|
|
Sulfur Dioxide |
1 hours |
0.52 ppm |
1.0 ppm |
2.0 ppm |
|
24 hours |
0.2 ppm |
0.7 ppm |
0.9 ppm |
* and predicted to persist for one additional hour.