2. Fresno, CA
Major Causes of Pollution: 5 (Oil Industry, Heavy Industry, Farming Industry, Manufacturing Industry, Water Dumping)
Fresno could be considered as an extremely polluted city. Despite the city being relatively safe, it suffers a lot from pollution from different angles. It is a convergence of oil, manufacturing, heavy industries and farming that are already three major industries that cause pollution for other cities as well. The water is highly contaminated and can even cause defects for unborn babies if pregnant women unwarily drink it.
