在监测的339个地级及以上城市中，细颗粒物（PM2.5）年平均浓度28.0微克/立方米，比上年下降4.4%。
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，这一点在im钱包官方下载中也有详细论述
The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents. We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far. The sciences, each straining in its own direction, have hitherto harmed us little; but some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the deadly light into the peace and safety of a new dark age.
圖像來源，Bettmann via Getty Images
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