Site

State

PM AQI* (ug/m3)

Socorro Hueco C49

TX

18

Ascarate Park Southeast C37

TX

16

Yuma Supersite

AZ

16

El Paso UTEP C12

TX

15

Santa Teresa

NM

13

Hidden Valley

AZ

11

Chamizal C41

TX

10

Alamo Lake

AZ

10

Santa Fe-705 Alta Vista St

NM

9

Nogales Post Office

AZ

9