Fresno tops Forbes dirtiest cities list

FRESNO, Calif.

They base the ranking on air quality, water supply and other criteria. Unfortunately, Fresno topped the list.

The magazine cites the Central Valley's geography as a major factor. The fact that the Valley traps a lot of pollutants led to Fresno's number one ranking.

The magazine also mentions issues with groundwater due to fertilizers and pesticides. But Fresno is not alone -- San Jose, Riverside and Los Angeles also made the top 20.

----- Click here for the Forbes Magazine article and complete list.

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