Illinois Environmental Protection Agency  
www.epa.state.il.us

Pat Quinn, Governor
Illinois Home



To report
environmental
emergencies
only
, call the
Illinois Emergency
Management Agency
800-782-7860
217-782-7860
(24 hrs/day)

Notice of Nondiscrimination
Notificacion Sobre Actos Discriminatorios
Inspector General

Agencies, Boards & Commissions

Illinois Legislature

FirstGov.gov

GovBenefits.gov

Kidz Privacy

Air Quality Information

Illinois Ozone Highs

1-Hr/8-Hr High Concentrations

(Values in Parts Per Billion)
First number in each column is 1-hour concentration - Standard of 125 parts per billion
Second number in each column is 8-hour concentration. - Standard of 75 parts per billion;

Region  County Site 8/26  8/27  8/28  8/29  8/30  8/31  9/1 
Chicago Metropolitan  Cook Alsip 54/41  57/48  52/49  55/50  50/47  48/44  59/52 
Cook Chicago - ComEd 49/37  43/41  47/43  50/44  47/43  47/42  52/47 
Cook Chicago - SWFP 44/40  38/38  53/46  49/44  44/40  40/38  48/44 
Cook Chicago - Taft --/--  48/44  43/42  60/53  49/45  54/50  52/49 
Cook Cicero 39/30  41/35  40/36  47/42  46/42  51/44  48/46 
Cook Des Plaines 47/38  44/40  43/40  58/51  45/43  48/45  49/46 
Cook Evanston 45/42  44/41  49/46  57/51  48/44  54/48  51/47 
Cook Lemont 52/37  61/44  49/41  49/43  44/40  42/38  47/42 
Cook Northbrook --/--  --/--  --/--  --/--  --/--  --/--  --/-- 
Cook Schiller Park 40/31  45/37  34/30  49/45  44/40  46/43  46/42 
DuPage Lisle 50/38  67/48  46/39  50/45  44/41  43/40  47/44 
Kane Elgin 50/40  56/47  51/43  55/47  44/41  40/39  48/44 
Lake Zion 38/32  41/37  47/43  62/53  45/42  62/54  49/45 
McHenry Cary 39/31  47/40  41/36  50/44  40/37  38/35  43/39 
Will Braidwood 42/35  61/48  47/41  44/38  40/36  39/35  50/46 
Metro East  Jersey Jerseyville 49/46  45/41  75/62  69/59  43/39  60/48  48/45 
Madison Alton 69/61  74/59  69/57  64/58  52/42  66/53  54/50 
Madison Maryville 92/75  83/60  56/53  61/56  43/43  49/45  61/53 
Madison Wood River 71/61  69/57  68/57  62/55  50/40  63/52  52/48 
Randolph Houston 63/59  74/61  59/53  61/55  44/44  45/38  56/51 
St. Clair East St. Louis 74/57  95/63  53/49  58/51  41/37  59/46  55/49 
Northern Illinois  Rock Island Rock Island 43/36  45/37  35/30  48/44  44/41  43/39  52/46 
Winnebago Loves Park --/--  45/40  49/42  51/48  41/43  40/39  47/43 
West Central Illinois  Adams Quincy 40/36  37/33  50/42  54/45  50/45  54/47  47/44 
Macoupin Nilwood 48/41  50/43  47/43  54/49  48/44  51/43  47/45 
Peoria Peoria 44/39  48/45  42/39  48/42  42/38  40/37  48/46 
Peoria Peoria Heights --/--  45/42  44/40  50/45  41/39  43/40  49/47 
Sangamon Springfield 53/44  42/42  52/46  54/50  53/46  50/45  50/47 
East Central Illinois  Champaign Thomasboro 47/42  41/37  50/45  45/41  41/38  46/40  50/45 
McLean Normal 53/44  47/45  52/47  53/50  50/43  49/43  55/51 
Macon Decatur 51/48  48/40  48/43  53/47  40/39  45/40  52/49 
Southeast Illinois  Effingham Effingham --/--  --/--  --/--  --/--  --/--  --/--  --/-- 
Hamilton Knight Prairie Township 50/46  54/48  44/40  59/52  42/41  35/31  40/31 

Air Menu

About the Bureau of Air
Forms
Publications
Annual Emission Report (AER)
Air Quality Information
AirFacts
Vehicle Emissions Testing
Partners for Clean Air
Permitting of Air Pollution Sources
Open Burning Permits
Emissions Reduction Market System (ERMS)
Asbestos Program
Other Bureau of Air Programs
NOx SIP Call and CAIR NOx Trading Programs
Illinois Green Fleets
MACT Training
Regulatory Development of Key Rules (CAIR/Mercury)
Illinois Climate Change Advisory Group
Registration of Smaller Sources (ROSS)
Small Business Environmental Assistance Program
Copyright © 1996-2011 Illinois EPA Agency Site Map | Privacy Information | Kids Privacy | Web Accessibility | Agency Webmaster