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On any given day, a news story might list a city in India as “most polluted.” In another story, a city in China may have held the distinction. Then again, maybe Iran hosts the most polluted city in the world, as a recent news report indicated.
The truth, however, is that no one knows what city has the highest level of pollution…
In a paper recently published in Atmospheric Environment: X, Martin outlines the extent of the gap between what researchers know and don’t know about on-the-ground levels of fine particulate matter, also known as PM2.5.