US counties by median Air Quality Index (US EPA), 2018
San Bernardino County 89, the highest of 1001 counties, 2018
- Under 33
- 33 to 37
- 37 to 40
- 40 to 44
- 44 to 48
- 48 and over
- No data
Boundaries: U.S. Census Bureau cartographic boundary files.
San Bernardino County 89, the highest of 1001 counties, 2018
Boundaries: U.S. Census Bureau cartographic boundary files.