The Air Quality Index measures pollution on a scale from 0-500, with anything above 300 listed as “hazardous”. On January 12th citizens of Beijing suffered a smoggy day that registered 755—quite literally off the charts.

The Air Quality Index measures pollution on a scale from 0-500, with anything above 300 listed as “hazardous”. On January 12th citizens of Beijing suffered a smoggy day that registered 755quite literally off the charts.

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