“@BeijingAir: 01-15-2015 00:00; PM2.5; 328.0; 378; Hazardous (at 24-hour exposure at this level)” > Calling it a 


night~
01-15-2015 00:00; PM2.5; 328.0; 378; Hazardous (at 24-hour exposure at this level)
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