寒冬将至

又一次冬天,又一次PM 2.5来袭!面临北京冬天的PM 2.5,我开始想:冬天PM 2.5到底比夏天严重多少?

我分析了北京和上海美国大使馆近8年的PM 2.5数据,结果冬天平均PM 2.5比北京的夏天多30%。上海的冬天比夏天多60%。

冬天比夏天-北京 冬天比夏天-上海

这有多严重?世界卫生组织PM 2.5的24小时上限是25微克(年上线是10微克!)。那么北京夏天平均PM 2.5是上限的三倍多,在北京冬天是四倍多。

中国全国年图

你不在北京或者上海住吗?其他城市的空气也不安全!

寒冬将至,做好准备!

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掐指一算,这个博客能风光一百年!

Justus Kirchhoff

The data from Mr. Cyr you cite is from May 2014. E.g. the Totobobo model used by him has been replaced by a newer model by now, which possibly performs differently. This is worth noting, I think.