@BeijingAir @Beijingairpix what worries me is when we start to see PM2.5 levels above 400 as 'just another day'.
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50以下がGood。Hazardousって、…死ぬかも。(喘息持ち) RT
@BeijingAir: 12-07-2013 15:00; PM2.5; 392.0; 428; Hazardous (at 24-hour exposure at this level)Thanks. Twitter will use this to make your timeline better. UndoUndo
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