
				Pat Quinn, Governor

Agency Links

Info Centers

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

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	4/10	4/11	4/12	4/13	4/14	4/15	4/16
Chicago Metropolitan	Cook	Alsip	41/38	56/51	55/53	42/37	38/31	43/42	47/45
	Cook	Chicago - ComEd	42/39	51/43	--/--	--/--	33/25	37/33	41/38
	Cook	Chicago - SWFP	48/42	56/48	49/47	42/41	39/36	43/41	48/44
	Cook	Chicago - Taft	49/37	52/45	49/46	36/33	32/29	38/36	43/40
	Cook	Cicero	43/36	52/44	44/42	34/28	32/27	39/36	43/40
	Cook	Des Plaines	50/41	55/48	54/48	45/39	34/31	39/38	44/42
	Cook	Evanston	47/34	52/46	51/47	42/40	41/35	42/40	48/45
	Cook	Lemont	47/42	58/52	53/51	35/32	38/30	45/42	49/47
	Cook	Northbrook	50/44	58/51	54/49	41/38	39/33	39/38	44/41
	Cook	Schiller Park	37/31	45/41	48/44	36/32	35/28	34/32	39/37
	DuPage	Lisle	48/42	54/48	50/47	33/31	35/30	40/38	43/41
	Kane	Elgin	50/45	55/51	52/48	42/35	39/33	40/39	45/42
	Lake	Zion	55/51	60/53	56/52	45/42	36/35	43/42	51/48
	McHenry	Cary	47/42	51/45	45/41	36/32	34/30	36/34	37/34
	Will	Braidwood	48/44	59/55	52/50	36/32	39/36	45/44	49/46
Metro East	Jersey	Jerseyville	59/54	55/53	48/44	47/40	44/33	44/42	48/45
	Madison	Alton	61/57	58/54	48/45	48/39	44/35	46/44	48/46
	Madison	Maryville	64/60	61/56	49/46	44/41	46/34	47/44	52/50
	Madison	Wood River	61/55	58/54	46/44	41/36	42/32	43/40	48/46
	Randolph	Houston	64/60	60/56	49/47	47/47	48/40	50/47	56/52
	St. Clair	East St. Louis	59/55	57/54	48/45	40/36	40/31	46/42	50/47
Northern Illinois	Rock Island	Rock Island	51/49	59/57	57/54	49/37	43/36	49/46	51/47
Northern Illinois	Winnebago	Loves Park	--/--	--/--	--/--	--/--	--/--	--/--	--/--
West Central Illinois	Adams	Quincy	49/45	61/58	53/50	46/39	37/36	49/46	55/52
	Macoupin	Nilwood	61/54	59/55	50/47	40/37	44/33	46/43	51/47
	Peoria	Peoria	45/42	58/54	56/49	40/31	40/30	45/43	45/41
	Peoria	Peoria Heights	47/44	59/56	57/52	44/35	40/31	41/39	46/43
	Sangamon	Springfield	51/46	50/47	45/41	36/31	40/28	39/36	43/41
East Central Illinois	Champaign	Thomasboro	58/50	57/53	49/47	38/33	43/33	41/40	47/44
	McLean	Normal	47/43	62/56	53/50	44/37	41/36	46/43	48/44
	Macon	Decatur	60/52	62/57	49/47	40/35	44/33	44/42	47/44
Southeast Illinois	Effingham	Effingham	57/54	55/52	50/48	39/38	43/36	44/42	44/42
Southeast Illinois	Hamilton	Knight Prairie Township	62/59	55/53	53/51	40/44	47/43	45/43	51/48