The report found that the top five most polluted countries in 2022 were Chad, Iraq, Pakistan, Bahrain and Bangladesh.
The most polluted cities globally were Lahore, Pakistan; Hotan, China; Bhiwadi, India; Delhi, India; and Peshawar, Pakistan.
Lahore's air quality worsened to 97.4 micrograms of PM 2.5 particles per cubic meter in 2022 from 86.5 in the year prior, making it the most polluted city in the world. The report also said India and Pakistan endured the worst air quality in the Central and South Asian region, where more than half of the population resides in areas where the concentration of PM 2.5 particles is about seven times higher than WHO's suggested levels.
In the U.S., the most polluted major cities were Columbus, Ohio, followed by Atlanta, Chicago, Indianapolis and Dallas. Air quality in Columbus hit 13.1 micrograms of PM 2.5 particles per cubic meter in 202, making it the most polluted major city in the U.S. The Biden administration this year proposed limiting pollution of industrial fine soot particles from the current annual level of 12 micrograms per cubic meter to a level between 9 and 10 micrograms per cubic meter. Some public health advocates criticized that proposal as not going far enough.Only six countries met the WHO's updated health limits: Australia, Estonia, Finland, Grenada, Iceland and New Zealand, the report said.
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