Columbus, Ohio, was the most polluted major U.S. city for the second year running.
The 10 most polluted major cities in the United States last year all experienced air quality that exceeded World Health Organization guidelines by two-three times, according to an annual report by Swiss air technology company IQAir.For the second year running, Columbus, Ohio, was America's most polluted major city, reporting an annual average 13.9 micrograms per cubic meter of particulate pollutants smaller than 2.
5 levels in Minneapolis and Detroit rose 30-50 percent compared to previous years, while pollution levels in Milwaukee spiked 51 percent from 2022.On the West Coast, wildfire prevention and mitigation efforts saw PM2.5 levels decline in Portland by 37 percent, in Seattle by 36 percent, and in Los Angeles by 10, said IQAir.At average PM2.5 levels of 4.9 µg/m³, Las Vegas was the least polluted city in the U.S. last year, falling just within WHO guidelines.
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