RT @BeijingAir: 10-24-2014 21:00; PM2.5; 356.0; 405; Hazardous (at 24-hour exposure at this level)pic.twitter.com/GV40jFFrqt
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10-24-2014 21:00; PM2.5; 356.0; 405; Hazardous (at 24-hour exposure at this level)
RT @BeijingAir: 10-24-2014 21:00; PM2.5; 356.0; 405; Hazardous (at 24-hour exposure at this level)pic.twitter.com/GV40jFFrqt
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