Site

State

PM AQI* (ug/m3)

Hidden Valley

AZ

31

Yuma Supersite

AZ

21

Grand Canyon ozone bench

AZ

14

Ascarate Park Southeast C37

TX

14

Geronimo

AZ

13

Socorro Hueco C49

TX

11

Amarillo Texas A&M C320

TX

11

South Valley

NM

11

Thirty Third

AZ

11

Nogales Post Office

AZ

11