
				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	5/15	5/16	5/17	5/18	5/19	5/20	5/21
Chicago Metropolitan	Cook	Alsip	57/50	57/51	35/27	53/47	58/55	65/59	61/56
	Cook	Chicago - ComEd	59/53	58/54	37/26	55/49	65/58	68/62	59/54
	Cook	Chicago - SWFP	61/59	68/61	48/42	65/62	75/71	71/65	65/59
	Cook	Chicago - Taft	59/56	56/53	38/32	55/52	39/24	--/--	53/50
	Cook	Chicago - University	50/48	55/50	42/33	53/47	58/53	55/49	50/43
	Cook	Cicero	58/52	55/51	33/27	54/50	66/58	70/64	59/54
	Cook	Des Plaines	51/48	51/48	35/31	55/52	63/57	60/54	47/43
	Cook	Evanston	59/57	57/48	42/38	59/57	74/69	69/61	54/50
	Cook	Lemont	66/59	65/57	34/21	48/45	60/55	68/65	55/51
	Cook	Northbrook	62/58	64/57	36/34	57/55	72/69	74/69	58/55
	Cook	Schiller Park	51/45	53/48	31/27	49/47	69/56	63/58	50/44
	DuPage	Lisle	59/52	58/51	29/20	45/44	56/52	63/58	49/46
	Kane	Elgin	57/54	71/59	40/33	53/51	60/57	69/65	53/50
	Lake	Zion	58/56	61/53	41/36	64/58	83/74	75/72	59/56
	McHenry	Cary	59/54	65/59	42/35	62/57	72/62	67/65	55/50
	Will	Braidwood	55/51	60/54	56/45	47/43	53/50	63/57	55/51
Metro East	Jersey	Jerseyville	58/56	54/50	53/47	54/49	62/50	63/53	53/47
	Madison	Alton	67/62	54/49	52/45	51/46	60/49	64/47	53/47
	Madison	Maryville	67/58	56/48	42/38	46/43	44/41	59/48	47/44
	Madison	Wood River	66/61	51/46	47/44	47/44	55/48	61/48	50/43
	Randolph	Houston	62/58	54/46	48/45	46/44	51/46	65/55	45/40
	St. Clair	East St. Louis	63/59	52/44	43/40	50/46	45/42	57/43	43/39
Northern Illinois	Rock Island	Rock Island	52/44	56/47	53/50	46/41	50/45	56/52	44/34
Northern Illinois	Winnebago	Loves Park	53/49	65/59	37/33	53/51	56/53	66/63	46/42
West Central Illinois	Adams	Quincy	65/60	54/45	56/54	55/50	50/52	60/54	41/38
	Macoupin	Nilwood	61/60	55/51	55/51	50/48	48/47	63/55	63/56
	Peoria	Peoria	56/51	56/48	49/44	42/40	40/36	59/53	43/39
	Peoria	Peoria Heights	63/56	68/60	61/57	51/48	47/44	70/65	51/48
	Sangamon	Springfield	65/62	64/53	55/51	49/46	49/45	68/60	60/56
East Central Illinois	Champaign	Thomasboro	66/64	66/59	58/53	47/42	53/50	59/54	56/51
	McLean	Normal	75/69	71/62	63/59	54/51	56/54	73/68	68/62
	Macon	Decatur	64/62	49/45	51/48	49/45	46/44	60/51	52/49
Southeast Illinois	Effingham	Effingham	72/67	50/44	49/47	48/45	48/45	63/51	56/52
Southeast Illinois	Hamilton	Knight Prairie Township	70/66	62/55	44/41	44/41	53/45	42/39	55/51