Site

State

PM AQI* (ug/m3)

Denver

CO

18

Credit Union

SD

15

UC1

SD

14

2912 Coffey

NE

14

Watertown

SD

13

Boulder - CU - 2102 Athens St.

CO

13

KNI-Topeka

KS

13

Sioux Falls

SD

12

Research Farm

SD

12

Globeville

CO

12