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Haze episodes often hit urban cities in China recently. Here, we present several continuous haze episodes with extremely high PM 2.5 levels that occurred over several weeks in early 2013 and extended across most parts of the northern and eastern China—far exceeding the Beijing–Tianjin–Hebei region. Particularly, the haze episode covered ~1millionkm 2 on January 14, 2013 and the daily...
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