US counties by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2008
Kern County 53.3%, the highest of 1050 counties, 2008
- Under 0.3
- 0.3 to 0.9
- 0.9 to 1.9
- 1.9 to 4.2
- 4.2 and over
- No data
Boundaries: U.S. Census Bureau cartographic boundary files.