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Majority of the world's population breathes dirty air, report says

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Switzerland -based air quality monitoring database IQAir analyzed data from 40,000 monitoring stations.

Chad , Congo , Bangladesh , Pakistan and India had the dirtiest air.

India had six of the nine most polluted cities with the industrial town of Byrnihat in northeastern India the worst.

The World Health Organization estimates that air pollution kills around 7 million people each year .