BEIJING - A bout of choking smog that brought life to a standstill in a far northeast Chinese city for three days has dissipated, with flights resuming and students returning to school Wednesday.
This NASA / NOAA satellite image taken on Tuesday shows heavy smog has shrouded much of eastern China, and air quality levels have been dropped to extremely dangerous levels. The heavy smog is caused by industrial pollution, coal and agricultural burning, and has been trapped by the mountains to the west and wind patterns.
Figures from monitoring stations on Wednesday morning showed that levels of the most harmful airborne particles, known as PM2.5, had dropped to an average of 123 micrograms per cubic metre in Harbin.
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