Site

State

PM AQI* (ug/m3)

Hidden Valley

AZ

25

Ascarate Park Southeast C37

TX

19

South Valley

NM

17

Jefferson

NM

14

North Valley

NM

14

Chamizal C41

TX

12

Nogales Post Office

AZ

12

Casa Grande Downtown

AZ

12

Socorro Hueco C49

TX

11

El Paso UTEP C12

TX

11