Which American Cities Consistently Experience the Highest Levels of Pollution?

Which American Cities Consistently Experience the Highest Levels of Pollution?

As of 2015, some American cities with consistent levels of pollution include Los Angeles-Long Beach, Visalia-Porterville, Bakersfield-Delano, Fresno-Madera and Sacramento-Roseville. These cities are all located in the state of California.

Pollution level rankings are determined in three ways: short-term particulate matter, ozone levels and year-round particulate matter. The most polluted city based on short-term and long-term particulate matter is Bakersfield-Delano, while the city with the worst ozone levels is Los Angeles-Long Beach. From all three categories, Californian cities consistently rank in the top five most polluted cities, with Bakersfield-Delano, Fresno-Madera and Los Angeles-Long Beach as repeat offenders on all three lists.