
				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	4/3	4/4	4/5	4/6	4/7	4/8	4/9
Chicago Metropolitan	Cook	Alsip	46/41	53/49	44/42	54/50	41/37	45/40	20/21
	Cook	Chicago - ComEd	45/43	60/56	46/44	59/55	42/39	47/43	25/20
	Cook	Chicago - SWFP	50/48	48/42	39/37	54/47	38/36	42/36	27/24
	Cook	Chicago - Taft	50/48	62/55	48/46	57/53	44/40	50/46	40/37
	Cook	Chicago - University	45/44	51/45	44/39	50/47	40/38	34/31	29/26
	Cook	Cicero	46/39	57/54	44/43	55/49	42/37	46/45	27/25
	Cook	Des Plaines	46/42	54/47	44/41	49/45	39/37	36/29	31/30
	Cook	Evanston	50/49	55/50	47/45	53/48	45/43	44/37	36/34
	Cook	Lemont	47/44	59/56	42/40	56/51	44/39	48/44	22/21
	Cook	Northbrook	50/48	60/55	47/44	56/52	44/42	42/38	36/35
	Cook	Schiller Park	37/34	43/40	36/33	49/43	34/30	35/28	26/25
	DuPage	Lisle	46/44	61/55	45/43	54/49	43/39	47/44	26/26
	Kane	Elgin	53/50	62/60	52/50	59/55	49/44	46/41	34/29
	Lake	Zion	51/50	60/56	47/46	59/52	44/43	43/36	40/38
	McHenry	Cary	47/46	57/54	47/44	52/49	44/41	42/36	33/31
	Will	Braidwood	57/46	58/56	46/43	52/48	43/39	49/46	48/40
Metro East	Jersey	Jerseyville	--/--	60/57	53/51	57/54	59/55	47/43	39/37
	Madison	Alton	56/53	60/58	55/53	59/55	62/56	49/43	41/38
	Madison	Maryville	54/51	61/57	56/52	58/56	58/54	44/41	39/37
	Madison	Wood River	54/51	61/57	56/52	57/55	62/57	48/43	36/34
	Randolph	Houston	57/53	58/53	56/51	58/56	55/50	42/39	40/37
	St. Clair	East St. Louis	54/51	57/53	56/50	57/55	61/53	45/41	39/36
Northern Illinois	Rock Island	Rock Island	50/46	--/--	--/--	--/--	--/--	--/--	37/25
Northern Illinois	Winnebago	Loves Park	53/49	55/51	50/47	49/45	42/40	40/36	34/32
West Central Illinois	Adams	Quincy	55/50	62/56	54/50	53/52	50/47	49/38	40/38
	Macoupin	Nilwood	55/51	63/59	60/56	58/55	52/49	47/43	45/41
	Peoria	Peoria	46/40	--/--	--/--	--/--	--/--	46/42	42/36
	Peoria	Peoria Heights	54/52	62/54	54/51	59/56	52/46	53/50	50/45
	Sangamon	Springfield	54/50	67/58	56/52	60/56	50/47	43/40	45/42
East Central Illinois	Champaign	Thomasboro	--/--	--/--	--/--	58/55	46/42	44/39	44/38
	McLean	Normal	56/54	60/57	58/54	62/59	53/48	54/51	54/47
	Macon	Decatur	52/49	56/52	54/51	57/53	47/44	42/37	39/36
Southeast Illinois	Effingham	Effingham	56/52	64/57	60/55	63/60	57/54	42/40	44/41
Southeast Illinois	Hamilton	Knight Prairie Township	55/52	59/57	57/55	61/57	56/53	47/44	42/40