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*


Carbon Monoxide

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.