Site

State

PM AQI* (ug/m3)

Liberty (SAHS)

PA

22

Lawrenceville

PA

14

Oldtown

MD

13

Steubenville

OH

13

Arendtsville

PA

12

Howard County Near Road

MD

12

Portland - Deering Oaks

ME

12

York

PA

11

Cicero2

IL

11

Division Street

NY

11