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The list of the world’s top 20 most polluted cities is out. All but one are in Asia

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All but one of the world’s top 20 most polluted cities last year were in Asia .

The majority of these cities are in India , where booming economic growth is fired largely by coal.

The only city outside of Asia featured on the list is N’Djamena , the capital of Chad in central Africa .

The cities with the worst pollution in North America were all in California .

Only 17% of 8,954 cities analyzed globally by IQAir recorded air quality which met WHO pollution guidelines.

Ontario , Bloomington and Huntington Park in California had the worst air pollution in North America .

Northern America has long boasted vigorous air quality monitoring systems.

Report calls on governments to dedicate funding for renewable energy projects and “strengthen emission limits for vehicles and industrial activities.