Site

State

NowCast

Brigham City

UT

26

Idaho City

ID

18

Hawthorne

UT

16

Smithfield

UT

15

Preston PM25 BAM

ID

13

Rose Park

UT

13

Idaho Falls / Penford

ID

11

Salmon PM2.5

ID

11

Copper View

UT

9

Spanish Springs

NV

8