Pollution “@BeijingAir: 02-03-2014 15:00; PM2.5; 4.0; 17; Good ” 17! Much lower pollution than when I was there.pic.twitter.com/OmdmfLeEQ0
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02-03-2014 15:00; PM2.5; 4.0; 17; Good (at 24-hour exposure at this level)
Pollution “@BeijingAir: 02-03-2014 15:00; PM2.5; 4.0; 17; Good ” 17! Much lower pollution than when I was there.pic.twitter.com/OmdmfLeEQ0
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