Site

State

AQI*

Delta

CO

24

Grand Junction - Powell Bui...

CO

21

UC1

SD

19

Research Farm

SD

17

Sioux Falls

SD

17

2912 Coffey

NE

16

Watertown

SD

15

NCORE

NE

14

KNI-Topeka

KS

13

Globeville

CO

12