Bakersfield (3rd dirtiest) - Air pollution, poor water quality, toxic waste.

Fresno (4th dirtiest) - Severe air pollution, poor water quality, high asthma rates.

Sacramento (5th dirtiest) - Poor air quality, contaminated waterways, asthma problems.

Sacramento (5th dirtiest) - Poor air quality, contaminated waterways, asthma problems.

Modesto (7th dirtiest) - Poor air quality, contaminated waterways, asthma problems.

Merced (10th dirtiest) - Poor air quality, contaminated soil, high asthma rates.

Hanford (12th dirtiest) - Poor air quality, contaminated waterways, asthma problems.