Most polluted cities in the world on Saturday

As of 10 a.m. according to the IQAir index.

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The US AQI (Air Quality Index) is a standardized scale used to measure and report air pollution levels. It ranges from 0 (good) to 500 (hazardous), with higher values indicating greater health risks.

Chart: Montreal GazetteSource: IQAir index.Created with Datawrapper