PM2.5 and ozone (IMAGE)

Science China Press

PM2.5 and ozone

Caption

(a, b) Annually mass concentration of PM2.5 and surface ozone in China, Jing-Jin-Ji (BTH), Yangtze River Delta (YRD) and Pearl River Delta (PRD) from 2013 to 2017. (c, d) Variation ratio of PM2.5 and ozone concentration in 2017 compared with that in 2013.

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