The Largest City In The World Is The Most Polluted

By Douglas McIntyre  •  October 22, 2025

Delhi, India, has a population of 33 million people. By most measurements, that makes it the largest city in the world. Based on air quality measurements, it is also the most polluted large city on Earth. The use of old cars and coal, along with farmers who burn off crops, increases the risk of blood, lung, and neural diseases. Douglas A. McIntyre, Editor-in-Chief of Climatecrisis247 reports

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