Site
State
PM AQI* (ug/m3)
Springville
CA
24
Mission Viejo
22
Riverton Mobile
WY
Reseda
21
Sapello-1033 NM-518
NM
20
North Holywood
Portola
Otay Mesa - Donovan
Yuma Supersite
AZ
19
Los Angeles - N. Main Street