Site

State

PM AQI* (ug/m3)

Rockford

IL

26

Eliza Howell- Roadway

MI

25

Joliet

IL

23

South Bend-Shields Dr

IN

23

Elkhart-Prairie St.

IN

23

Terre Haute-Lafayette Ave

IN

22

Clinton, Chancy Park

IA

22

Waterloo, Water Tower

IA

21

Lafayette-Greenbush St

IN

21

Fort Wayne-Beacon St

IN

20