Illinois PM2.5 24-hour Exceedance Summary

Value in each column is 24-hour concentration - standard of 35 micrograms per cubic meter

(values in micrograms per cubic meter)

Region	County	Site	8/6/25	8/3/25	8/1/25	7/31/25	7/21/25	7/14/25	7/4/25	6/7/25	6/6/25	6/5/25	6/4/25	3/15/25
Chicago Metropolitan	Cook	Alsip			44.1	58.2					37.2	49.0
	Cook	Chicago-Com Ed			38.1	53.9						43.8
	Cook	Chicago-Mayfair			47.6	74.0		39.8	79.9			59.5
	Cook	Chicago-Springfield Pump			46.1	72.8		39.5	54.7			58.9
	Cook	Chicago-Washington HS			47.1	66.2		44.4			36.8	59.3	43.5
	Cook	Cicero			47.4	70.8			40.3		37.8	58.2
	Cook	Des Plaines		39.2	46.3	77.7	38.5	36.5				55.3
	Cook	Kingery Near-Road			45.1	57.1						53.9
	Cook	McCook			49.8	68.5
	Cook	Northbrook			37.2	61.4						46.0
	Cook	Schiller Park	35.9	39.7	50.7	79.2	37.8	38.7				59.2
	Cook	Summit			50.9	70.1					39.9	53.3
	Du Page	Naperville			48.5	65.2					35.7	51.1
	Kane	Aurora			47.8	65.3						46.3
	Kane	Elgin		39.4	49.1	75.1						48.4
	McHenry	Cary		40.8	41.2	75.9						45.2
	Will	Braidwood			52.9	60.0				37.7	42.3	47.5
	Will	Joliet			50.3	62.5					42.8	48.6
Northern Illinois	Rock Island	Rock Island			57.7	78.8
Northern Illinois	Winnebago	Rockford		41.8	41.5	80.8	38.5
Central Illinois	Champaign	Bondville			50.7									39.5
	Champaign	Champaign			48.0									50.0
	McLean	Normal			55.7	51.5						43.8
	Macon	Decatur			51.0									51.6
	Peoria	Peoria			59.7	60.0					40.2	44.2
	Sangamon	Springfield			52.3	39.5					36.3
Metro-East	Jersey	Jerseyville			51.3
	Madison	Alton			46.7									57.7
	Madison	Granite City Fire Station			47.7									65.0
	Madison	Granite City-Gateway Medical			45.0									62.6
	Madison	Wood River			51.0									51.9
	Randolph	Houston												69.3
	St Clair	E St. Louis			44.7				35.6					69.3
Southern Illinois	Hamilton	Knight Prairie
Values Preliminary		Not Quality Assured