“@BeijingAir: 11-07-2014 07:00; PM2.5; 73.0; 160; Unhealthy (at 24-hour exposure at this level)” I knew it's coming back.
11-07-2014 07:00; PM2.5; 73.0; 160; Unhealthy (at 24-hour exposure at this level)
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@BeijingAir 难道河北的工厂都是晚上开工的吗?Thanks. Twitter will use this to make your timeline better. UndoUndo
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