Former U.S. Connecticut Environmental Protection Agency air quality mains Chris James said, according to U.S. standards, a regional air quality will be based on 24 hours to determine the concentration of PM2.5 to make assessment of the concentration does not judge the significance of a single hour.
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The Chinese people had been repeatedly cited the U.S. Embassy-hour concentration of PM2.5 monitoring data are based on a single hour basis. According to the reporter, the U.S. Embassy in Beijing to establish their own air quality observation stationsCheap Air Jordans Diamond Shoes
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air quality concentrations, the main monitoring PM2.5, the diameter of fine particles smaller than 2.5 microns. The Beijing environmental protection department, which monitors PM10, that is, less than 10 micron diameter particles.
Wang YS researcher at the Institute of Atmospheric Physics, Chinese Academy of Sciences told reporters that the reason why people feel the data closer to the U.S. Embassy’s own feelings, the main reason is that fine particles PM2.5.
“If excessive sulfur dioxide in the air, people often feel, but a significant increase in fine particulate matter, people will be very obvious that reduced visibility, with all the words, days of dirty honking.”
