Site

State

PM AQI* (ug/m3)

HOUGHTON LAKE

MI

12

Liberty (SAHS)

PA

11

Chester

PA

11

MLK

DE

10

ALSIP

IL

10

Portland - Deering Oaks

ME

10

Fall River

MA

10

Hagerstown

MD

9

Elizabeth Trailer

NJ

9

New Garden

PA

9