Site

State

PM AQI* (ug/m3)

Ascarate Park Southeast C37

TX

19

Grand Canyon ozone bench

AZ

15

Anthony

NM

14

Socorro Hueco C49

TX

14

Nogales Post Office

AZ

14

Yuma Supersite

AZ

14

Thirty Third

AZ

13

Geronimo

AZ

13

Hidden Valley

AZ

12

El Paso UTEP C12

TX

12