Site

State

PM AQI* (ug/m3)

Nogales Post Office

AZ

20

Durango Complex

AZ

15

South Phoenix

AZ

14

Thirty Third

AZ

13

Socorro Hueco C49

TX

12

Yuma Supersite

AZ

12

Hidden Valley

AZ

10

Ascarate Park Southeast C37

TX

9

Mesa - Brooks Reservoir

AZ

9

El Paso UTEP C12

TX

9