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West Virginia city on list of worst year-round particle pollution by: Alix Martichoux, Nexstar Media Wire Posted: Apr 10, 2022 Updated: Apr 10, 2022 (NEXSTAR) – The World Health Organization announced this week that 99% of the world’s population breathes poor-quality air, that when inhaled over time can cause cardiovascular and respiratory disease.

While cities in the developing world have the worst air quality, according to the WHO, pollution is still a problem in American cities. There are chronic sources of air pollution, like vehicle traffic on busy highways, as well as seasonal issues, like smoke from wildfires.

The American Lung Association tracks air pollution in U.S. cities. Its annual report uses data from the Environmental Protection Agency on the presence of two types of pollutants: ozone (or smog) and particulate matter. Particulate matter has many sources, such as transportation, power plants, agriculture, fires and industry – as well as from natural sources like desert dust.

Using the EPA data, the report ranks the most and least polluted metro areas.

The cities with the highest amount of ozone pollution (or smog) are:

Los Angeles-Long Beach, California Bakersfield, California Visalia, California Fresno-Madera-Hanford, California Phoenix-Mesa, Arizona Sacramento-Roseville, California San Diego-Chula Vista-Carlsbad, California Denver-Aurora, Colorado Salt Lake City-Provo-Orem, Utah San Jose-San Francisco-Oakland, California The cities with the worst year-round particle pollution are:

Bakersfield, California Fresno-Madera-Hanford, California Visalia, California Los Angeles-Long Beach, California Medford-Grants Pass, Oregon Fairbanks, Alaska San Jose-San Francisco-Oakland, California Phoenix-Mesa, Arizona Pittsburgh-New Castle-Weirton, Pennsylvania/Ohio/West Virginia El Centro, California “Particulate matter, especially PM2.5, is capable of penetrating deep into the lungs and entering the bloodstream, causing cardiovascular, cerebrovascular (stroke) and respiratory impacts,” WHO said. “There is emerging evidence that particulate matter impacts other organs and causes other diseases as well.”

The American Lung Association also keeps track of which cities have the least air pollution.

The ten cities with the cleanest air, free of particle pollution are:

Urban Honolulu, Hawaii Kahului-Wailuku-Lahaina, Hawaii Cheyenne, Wyoming Wilmington, North Carolina Casper, Wyoming St. George, Utah Bellingham, Washington Elmira-Corning, New York Sioux Falls, South Dakota Duluth, Minnesota/Wisconsin There are many cities that also scored well for smog-free air, but because they all had similar readings, the ALA did not rank them. You can see the full list of clean air cities in the American Lung Association’s report.