We told you earlier this week about how smog choked the northeast Chinese city of Harbin, which is home to 11 million people.
Today, we get a stunning look at just how bad the problem is from an image taken by the Suomi NPP satellite on Tuesday. That murky gray you see below is all smog:
Today, as the smog has cleared, National Geographic highlights a big reason for China's terrible pollution: Coal is used to fuel 70 percent of the country's energy needs.
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