林泉
日本政府敦促居民在空气污染物PM2.5平均数量超过每立方米70微克的时候———即超过该部门制定的每天最高许可水平35微克的两倍时———就待在室内。北京污染值通常超过这一水平10倍———周三晚上北京PM2.5值是每立方米273微克。
2014-06-08 14:17:38 发布
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