11. Riverside, CA
Major Causes of Pollution: 3 (Manufacturing Companies, Water Dumping, Traffic Congestion)
You might notice a lack of clean air and water in Riverside. This is because years ago, different manufacturing companies and factories have contaminated a lot of areas. Water nearby is contaminated, costing the city to get water from elsewhere. Air pollution is also a problem that’s why the city maintains a website for awareness of this fact. A lot of these substances in the air are carcinogenic, which is why this kind of pollution is very dangerous.
