Site

State

PM AQI* (ug/m3)

Camden Spruce St

NJ

22

Lancaster DW

PA

14

Padonia

MD

12

HU-Beltsville

MD

12

Leech Lake Nation: Cass Lake

MN

11

York

PA

10

Harrisburg

PA

9

RIT

PA

9

Elizabeth Trailer

NJ

9

Lebanon

PA

9