Site

State

PM AQI* (ug/m3)

South Valley

NM

24

Santa Teresa

NM

21

Hidden Valley

AZ

20

Odessa Gonzales C1014

TX

16

Nogales Post Office

AZ

16

Eagle Pass C319

TX

14

Socorro Hueco C49

TX

13

El Paso UTEP C12

TX

12

Ascarate Park Southeast C37

TX

11

Yuma Supersite

AZ

11