In 2020, The Largest County In Each Category Was …

HAZARDOUS

VERY UNHEALTHY

UNHEALTHY

King County,

Wash.

(Seattle)

2.3 million

people

 

Los Angeles County,

Calif.

10 million

 

Alameda County,

Calif.

(Oakland)

1.7 million

VERY

UNHEALTHY

HAZARDOUS

UNHEALTHY

King County,

Wash.

(Seattle)

2.3 million

people

 

 

Alameda County,

Calif.

(Oakland)

1.7 million

Los Angeles County,

Calif.

10 million

 

HAZARDOUS

UNHEALTHY

King County,

Wash.

(Seattle)

2.3 million

people

 

 

Los Angeles

County, Calif.

10 million

VERY

UNHEALTHY

Alameda

County,

Calif.

(Oakland)

1.7 million