Site

State

PM AQI* (ug/m3)

Ascarate Park Southeast C37

TX

28

Santa Teresa

NM

28

Hidden Valley

AZ

22

Anthony

NM

20

Socorro Hueco C49

TX

19

Buckhorn-12 Mesa Rd

NM

18

El Paso UTEP C12

TX

18

Yuma Supersite

AZ

17

Nogales Post Office

AZ

16

Hobbs Jefferson

NM

15