City as a major source area of fine particulate (PM2.5) in China

Han, Lijian; Zhou, Weiqi; Li, Weifeng

City as a major source area of fine particulate (PM2.5) in China

2015

Han, Lijian | Zhou, Weiqi | Li, Weifeng

The PM2.5 concentration in 31% of China's territorial areas was less than 10 μg/m3, and in 26% of China's territorial areas was higher than 35 μg/m3. High concentrations of PM2.5 were found in the East China Plain, Sichuan province, and the Taklimakan desert. East China Plain was also found with strong significant positive trends. 73% of artificial surface (L01) was found with significant positive trends, but only 2% with significant negative trends. 76% of cropland (L02) was observed with significant positive trends, but only 2% with significant negative trends. The mean significant trends of PM2.5 concentration were 1.81 μg/m3·year for L01 and 1.71 μg/m3·year for L02, higher than that for the rest land covers. The PM2.5 pollution brought potential health risk to susceptible population: only 1% of thm lives at a safe level (<10 μg/m3), but 69% of them were exposed to heavy PM2.5 pollution (>35 μg/m3).

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