RT “@BeijingAir: 05-13-2013 02:00; PM2.5; 50.0; 137; Unhealthy for Sensitive Groups (at 24-hour exposure at this level)”. COME ON!!
05-13-2013 02:00; PM2.5; 50.0; 137; Unhealthy for Sensitive Groups (at 24-hour exposure at this level)
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