Real Time AQI: Top Polluted Cities in United States

Siskiyou County, California

Unhealthy Air Quality Index

AQI: 156
Whatcom County, Washington

Unhealthy Air Quality Index

AQI: 154
Crook County, Oregon

Unhealthy Air Quality Index

AQI: 153
Santa Cruz County, California

USG Air Quality Index

AQI: 149
Lane County, Oregon

USG Air Quality Index

AQI: 148
Klamath County, Oregon

USG Air Quality Index

AQI: 145
Missaukee County, Michigan

USG Air Quality Index

AQI: 135
Clark County, Washington

USG Air Quality Index

AQI: 134
Linn County, Oregon

USG Air Quality Index

AQI: 132
Snohomish County, Washington

USG Air Quality Index

AQI: 122

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