@BeijingAir Sorry to bother! May I get this twitter's archive? It would contain very useful history data of PM2.5 for acedemic research!
01-26-2014 23:00; PM2.5; 119.0; 184; Unhealthy (at 24-hour exposure at this level)
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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