又一次冬天，又来一次PM2.5来袭！面临北京冬天的PM2.5，我开始想：冬天PM2.5到底比夏天差多少？
我分析了北京美国大使馆近7年的PM2.5数据，结果夏天平均PM2.5为92微克，冬天为111微克。
这有多严重？世界卫生组织PM2.5的24小时上限是25微克。那么北京夏天平均PM2.5是上限的三倍多，冬天是四倍多。
寒冬将至，做好准备！
寒冬（的雾霾）将至
- Thomas Talhelm
- Thomas Talhelm
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