Illinois Ozone 8-hour Exceedance Summary

8-hour Exceedances Summary

Values in each column is 8-hour concentration - standard of 70 parts per billion;

Region	County	Site	7/22/25	7/15/25	7/14/25	7/2/25	6/16/25	6/12/25	6/11/25	6/7/25	6/5/25
Chicago Metropolitan	Cook	Alsip					71	71
	Cook	Chicago - Com Ed					71
	Cook	Chicago - SWFP		75	89	75	78		77
	Cook	Chicago - Taft			84		74		74
	Cook	Cicero			78		73		73
	Cook	Des Plaines			75
	Cook	Evanston		74	80	73	73		72
	Cook	Lemont
	Cook	Northbrook			77
	Cook	Schiller Park
	DuPage	Lisle
	Kane	Elgin					81	75		72
	Lake	Zion		71			73		71
	McHenry	Cary	76				80	72	72
	Will	Braidwood
Metro-East	Jersey	Jerseyville							76
	Madison	Alton
	Madison	Maryville
	Madison	Wood River
	Randolph	Houston
	St. Clair	East St. Louis
Northern Illinois	Rock Island	Rock Island
Northern Illinois	Winnebago	Loves Park						73
West Central Illinois	Adams	Quincy
	Macoupin	Nilwood
	Peoria	Peoria									73
	Peoria	Peoria Heights									73
	Sangamon	Springfield
East Central Illinois	Champaign	Thomasboro
	McLean	Normal									74
	Macon	Decatur
Southeast Illinois	Effingham	Effingham
Southeast Illinois	Hamilton	Knight Prairie Township