@BeijingAir In one hour from Very Unhealthy to Good? 11:59 am PM2.5 211.2; Very Unhealthy. 13:00 pm PM2.5 7.0 good! Why? Heavy Rain?
02-14-2013 13:00; PM2.5; 7.0; 23; Good (at 24-hour exposure at this level)
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