Skip to Navigation
Skip to Content
Home > 2009 > States > Illinois

Illinois

County Grade Wgt.
Avg. 		Orange
Days 		Red
Days 		Purple
Days
Adams D 2.7 8 0 0
Champaign B 0.7 2 0 0
Clark B 0.7 2 0 0
Cook F 16.2 41 5 0
Dupage C 1.7 5 0 0
Effingham C 1.7 5 0 0
Hamilton D 3.0 9 0 0
Jersey F 6.0 18 0 0
Kane F 4.0 12 0 0
Lake F 8.8 25 1 0
Lasalle - - - - -
Macon F 3.3 10 0 0
Macoupin C 2.0 6 0 0
Madison F 20.3 55 4 0
Mchenry F 4.7 14 0 0
Mclean F 4.0 12 0 0
Peoria F 3.7 11 0 0
Randolph F 4.0 12 0 0
Rock Island C 1.0 3 0 0
Sangamon C 1.7 5 0 0
St. Clair F 9.8 22 5 0
Will C 2.0 6 0 0
Winnebago C 1.7 5 0 0
Contribute to Cleaner Air: Donate

Notes:

(1) * indicates incomplete monitoring data for all three years. Therefore, those counties are excluded from the grade analysis.
(2) A dash (-) indicates that there is no monitor collecting data in the county.

More about Methodology.