Halved in an hour? No. Four air purifiers & I'm choking in my apartment. “@BeijingAir: 10-29-2013 01:00; PM2.5; 144.0; 197; Unhealthy..”
10-29-2013 01:00; PM2.5; 144.0; 197; Unhealthy (at 24-hour exposure at this level)
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