U.S. Most and Least Polluted Cities: Check out the list

A report by IQAir highlights the most and least polluted cities in the US in 2024. The study analyzed data from thousands of air monitoring stations worldwide.

IQAir states that air pollution is the biggest environmental threat to human health. The World Health Organization (WHO) reports that 99% of people live in areas with unsafe air quality levels. Air pollution is the second leading cause of death globally. It also poses serious health risks to children under five, second only to malnutrition.

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U.S. Most Polluted Cities

The U.S. also has pollution hotspots. Ontario, California, is the most polluted city in the country. Los Angeles ranks as the most polluted major city. The top five most polluted cities are in California. Here are the 10 most polluted U.S. cities in 2024:

Ontario, California
Bloomington, California
Huntington Park, California
San Bernardino, California
Fontana, California
Visalia, California
Mission, Texas
Glendora, California
Hanford, California
Conroe, Texas

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U.S. Least Polluted Cities

Seattle, Washington, is the cleanest major city in the U.S. Waimea, Hawaii, has the least pollution among regional cities. The U.S. ranked 116 in the World Air Quality Report. Here are the 10 least polluted U.S. cities:

Waimea, Hawaii
Ocean View, Hawaii
Seaside, California
Stanwood, Washington
Mountain View, Hawaii
Lander, Wyoming
Astoria, Oregon
Tillamook, Oregon
Silverdale, Washington
Kihei, Hawaii

FAQs

Why are South Asian countries the most polluted?
South Asian countries have high pollution due to industrial emissions, vehicle exhaust and burning of biomass. Rapid urbanization and lack of strict environmental regulations also contribute to the problem.

What steps can be taken to reduce air pollution?
Governments can reduce pollution by enforcing stricter emission laws, promoting clean energy and improving public transport. Individuals can help by using eco-friendly transportation and reducing waste.