北京の空が少しおかしい。梅雨のような雲が垂れてるし。“@BeijingAir: 07-31-2014 22:00; PM2.5; 187.0; 237; Very Unhealthy (at 24-hour exposure at this level)”
07-31-2014 22:00; PM2.5; 187.0; 237; Very Unhealthy (at 24-hour exposure at this level)
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