One in five people in the US facing extreme heat alerts | BBC News

About 80 million people in the US are currently subject to an extreme heat warning, as a huge dome of hot air hovers over mid-Western and Eastern states. In the West, firefighters are still battling to bring several wildfires under control. Weather warnings have also been issued in four Canadian provinces. The extreme heat has been described by the National Weather Service as the region's first significant heatwave of the season.

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