§244.163. Criteria for Declaring a Yellow Alert

The Director or his/her designated representative shall declare a yellow alert whenever:

 

a)         Any yellow alert level is equaled or exceeded at any monitoring station; and

 

b)         An air pollution advisory has been in effect for 4 hours in the area for which the yellow alert is to be declared; and

 

c)         Atmospheric conditions, or expected contaminant emissions, are such that concentrations can reasonably be expected to remain at or above the yellow alert level for 12 or more hours; or

 

d)         For ozone, atmospheric conditions, or expected contaminant emissions, are such that concentrations can reasonably be expected to reoccur at a yellow alert level on the following calendar day.

 

(Source:  Amended at 16 Ill. Reg. 8191, effective May 15, 1992)