Site

State

PM AQI* (ug/m3)

Steubenville

OH

26

Lancaster DW

PA

24

Allentown

PA

24

Liberty (SAHS)

PA

22

Beaver Falls

PA

22

Bridgeport

CT

22

Charleroi

PA

22

Johnstown

PA

21

Freemansburg

PA

21

Houston

PA

20