Extreme heatwaves continue to grip US as millions under heat and air quality alerts –

As of Thursday morning, three major cities in the US were ranked as the top three places in the world with the worst air quality.

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According to the air tracking service IQAir, Chicago, Detroit and Washington DC topped air quality index charts with all three cities’ air being classified as “unhealthy”.

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This is the second consecutive day for Chicago and Detroit to be ranked as the most polluted cities in the world as smoke from Canada’s wildfires blanket the majority of the…

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