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Impenetrable smog smothers Chinese cities
An Oct. 22 satellite image shows smog (gray) over eastern China.NASA / AFP - Getty Images
Thick smog enveloped China's northeast area for a third day on Wednesday, with schools and regional airports shuttered and low visibility forcing ground transport to a halt in places. The average visibility at times was less than 16 feet at 6 a.m. Tuesday, according to local media.