= List of least polluted cities by particulate matter concentration
{wiki=List_of_least_polluted_cities_by_particulate_matter_concentration}
As of my last training cut-off in October 2023, comprehensive and up-to-date rankings of the least polluted cities by particulate matter (PM2.5) concentration can typically be found in annual reports from organizations like the World Health Organization (WHO) or the IQAir World Air Quality Report. These reports usually rank cities based on average annual PM2.5 levels.
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