Cheyenne, Wyoming has the cleanest air in the US due to its low levels of particulate matter and short-term spikes in pollution. Its small population is thought to contribute to its clean air.
Cheyenne, Wyoming, is the US city with the cleanest air, according to findings from the American Lung Association. The city with fewer than 89,000 residents has the lowest score for particulate matter (PM 2.5), which refers to fine matter in the air that is less than 2.5 micrometres in diameter. PM 2.5 ratings are important for measuring air quality because particulate matter so small can be absorbed into the lungs. Cheyenne also has the lowest levels of short-term spikes in exposure to pollution, which can cause asthma and heart attacks. The city’s small population is thought to contribute to its clean air due to less pollution from vehicles.
Read more about air quality around the world:
Particulate matter smaller than 2.5 micrometres is about 1/30 the width of a human hair.
It is estimated that nearly half of the US population, or more than 147 million people, live in areas with potentially dangerous levels of air pollution.
Tasmania is thought to have the cleanest air in the world, with quality levels partly with unpopulated Antarctica.
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