
				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	4/17	4/18	4/19	4/20	4/21	4/22	4/23
Chicago Metropolitan	Cook	Alsip	47/44	45/43	50/42	71/66	54/44	45/42	45/44
	Cook	Chicago - ComEd	49/45	48/46	51/44	--/--	58/47	45/43	46/45
	Cook	Chicago - SWFP	48/41	49/47	51/48	64/59	52/41	43/42	47/44
	Cook	Chicago - Taft	49/43	46/44	50/42	72/66	51/42	46/42	44/43
	Cook	Cicero	49/45	45/42	50/42	70/63	55/45	45/40	44/42
	Cook	Des Plaines	49/43	46/44	53/46	71/65	47/30	45/42	45/43
	Cook	Evanston	49/43	50/47	52/48	66/61	49/44	44/42	45/44
	Cook	Lemont	51/45	42/38	59/55	75/70	57/51	52/45	--/--
	Cook	Northbrook	53/45	46/45	50/46	71/64	51/45	44/41	44/42
	Cook	Schiller Park	37/33	41/38	47/37	67/61	40/32	40/34	37/35
	DuPage	Lisle	47/42	41/38	56/48	68/63	50/44	51/43	42/40
	Kane	Elgin	43/41	44/42	58/47	66/61	45/41	52/45	48/44
	Lake	Zion	51/48	50/48	52/50	69/66	55/48	47/44	46/45
	McHenry	Cary	37/36	42/39	43/41	57/53	43/37	47/42	41/39
	Will	Braidwood	47/45	51/46	55/52	73/68	59/50	53/49	50/46
Metro East	Jersey	Jerseyville	47/44	57/53	67/63	75/70	55/47	50/47	50/45
	Madison	Alton	54/50	58/55	66/62	73/69	55/48	53/50	53/49
	Madison	Maryville	57/47	61/58	68/64	72/69	59/51	54/51	54/51
	Madison	Wood River	53/49	57/54	65/61	72/68	52/40	51/47	49/45
	Randolph	Houston	63/59	64/60	71/68	71/68	53/50	57/53	58/55
	St. Clair	East St. Louis	53/49	63/57	64/62	71/66	49/44	49/47	53/49
Northern Illinois	Rock Island	Rock Island	45/42	55/49	64/61	65/62	55/41	50/48	47/42
Northern Illinois	Winnebago	Loves Park	45/38	57/52	62/54	68/64	46/40	51/49	53/48
West Central Illinois	Adams	Quincy	46/38	61/58	71/67	62/60	50/46	56/54	55/53
	Macoupin	Nilwood	52/47	59/55	64/60	72/68	52/47	52/48	52/48
	Peoria	Peoria	43/40	58/54	61/58	70/65	48/42	53/50	54/50
	Peoria	Peoria Heights	41/38	53/50	60/57	66/63	47/41	48/45	49/46
	Sangamon	Springfield	38/36	51/48	53/51	59/57	46/39	46/41	48/45
East Central Illinois	Champaign	Thomasboro	51/47	56/52	54/50	69/65	49/46	48/45	49/46
	McLean	Normal	43/41	59/55	62/58	73/70	53/44	53/49	57/51
	Macon	Decatur	51/48	60/57	64/60	72/67	52/47	54/51	54/49
Southeast Illinois	Effingham	Effingham	56/50	59/55	63/58	66/63	55/48	53/49	51/48
Southeast Illinois	Hamilton	Knight Prairie Township	60/56	63/60	68/63	67/63	58/54	53/50	54/50