
				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	7/22	7/23	7/24	7/25	7/26	7/27	7/28
Chicago Metropolitan	Cook	Alsip	50/48	40/32	41/37	44/42	65/54	47/44	37/30
	Cook	Chicago - ComEd	55/49	34/29	36/32	41/39	66/55	44/41	32/27
	Cook	Chicago - SWFP	48/46	39/27	29/27	40/38	66/57	39/36	24/23
	Cook	Chicago - Taft	51/44	35/25	26/24	38/35	78/61	37/34	25/23
	Cook	Cicero	59/52	37/28	32/29	40/38	76/63	41/40	32/27
	Cook	Des Plaines	56/52	35/29	30/29	45/39	81/66	41/39	30/26
	Cook	Evanston	66/55	30/28	34/28	45/38	82/69	41/40	26/25
	Cook	Lemont	53/47	37/28	37/34	41/39	57/46	38/36	35/32
	Cook	Northbrook	59/56	30/28	30/28	49/43	77/64	42/40	27/25
	Cook	Schiller Park	49/44	38/28	27/26	39/35	79/58	38/33	29/25
	DuPage	Lisle	--/--	--/--	--/--	--/--	--/--	--/--	--/--
	Kane	Elgin	53/47	39/33	40/36	40/39	53/46	39/36	32/31
	Lake	Zion	61/54	29/28	30/28	50/46	80/68	41/41	26/25
	McHenry	Cary	50/45	39/34	40/35	41/40	53/48	39/36	33/31
	Will	Braidwood	44/40	37/35	53/47	42/38	37/33	41/39	42/35
Metro East	Jersey	Jerseyville	66/55	42/36	45/41	47/38	44/39	39/36	28/29
	Madison	Alton	83/74	47/44	48/45	48/41	61/49	46/40	30/29
	Madison	Maryville	69/63	49/44	49/46	52/44	63/54	48/48	33/31
	Madison	Wood River	83/73	--/--	--/--	46/40	65/48	45/39	29/28
	Randolph	Houston	59/54	51/45	50/47	58/51	55/46	53/51	43/40
	St. Clair	East St. Louis	70/63	48/44	49/46	50/36	53/48	50/43	33/29
Northern Illinois	Rock Island	Rock Island	52/43	33/32	37/34	37/34	50/43	34/31	30/27
Northern Illinois	Winnebago	Loves Park	51/47	36/33	43/37	43/41	54/47	39/35	37/32
West Central Illinois	Adams	Quincy	39/32	36/34	38/36	44/40	49/42	36/35	30/28
	Macoupin	Nilwood	71/57	49/44	45/42	46/46	39/35	38/36	32/29
	Peoria	Peoria	40/38	43/41	49/44	40/36	39/32	41/39	33/29
	Peoria	Peoria Heights	46/43	43/41	50/47	45/39	40/33	42/39	34/30
	Sangamon	Springfield	74/54	45/42	43/40	45/37	40/37	36/34	28/26
East Central Illinois	Champaign	Thomasboro	59/54	41/35	41/38	43/34	41/36	42/37	37/28
	McLean	Normal	52/47	48/44	52/47	42/40	50/40	44/40	35/30
	Macon	Decatur	63/55	47/42	48/44	44/38	50/44	42/38	32/29
Southeast Illinois	Effingham	Effingham	57/54	43/37	42/35	41/34	54/47	43/39	34/30
Southeast Illinois	Hamilton	Knight Prairie Township	61/56	43/38	41/38	50/43	51/45	48/45	35/33