Site

State

PM AQI* (ug/m3)

East St. Louis

IL

14

Brockton

MA

12

Groton Fort Griswold

CT

12

Boston-Von Hillern

MA

12

Worcester

MA

11

Brigantine

NJ

11

Bridgeport

CT

11

Canton

OH

10

Boston - Roxbury

MA

10

Pocomoke City

MD

10