Site

State

PM AQI* (ug/m3)

Arendtsville

PA

27

Hagerstown

MD

24

Lancaster DW

PA

22

York

PA

21

Lancaster

PA

20

Indpls - I-70 E

IN

20

Carlisle

PA

20

Harrisburg

PA

20

Chester

PA

19

SEAFORD

DE

18