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Car only after a few days time, from 6 onwards, haze days in North Huanghuai region is making a comeback. Yesterday, 18:30, Beijing heavy air pollution alert level from orange to red lift, which is Beijing's first start heavy air pollution red alert. Central Meteorological Observatory predicted, within 10 days, subject to the combined effect of cold air and precipitation, fog, haze will gradually weaken and dissipate from north to south. Whenever severe haze north, south and we can not separate the good. Yesterday, 17:00, AQI real-time data and real-time PM2.5 concentrations Hangzhou plurality of air quality monitoring sites, mild pollution and moderate pollution, including primary and harmony Zhaohui five districts heavily polluted sites. Is expected today in Hangzhou AQI is 70-90, it is the primary pollutant PM2.5, good air quality level. Haze how again? China Environmental Protection Industry Association president Yang Chaofei explained, 'For the current domestic haze hardest hit, the blue sky and white clouds are relying on the wind, a wind blowing, haze away, the wind stops, haze cometh cycle now appears haze short, is because of the lack of long-term course of treatment haze governance mechanisms, due to the haze temporarily scattered mainly by the wind, but this is because of the short interval haze waning these days the cold air. 'yesterday, the Ministry of environmental Protection, said motor vehicles, industrial production, coal, dust is the main source of pollution in most cities in China current ambient air particulate matter, about 85% to 90%. Wherein the primary source of pollution in Beijing, Hangzhou, Guangzhou, Shenzhen motor vehicle; the primary sources of pollution, Tianjin, Shanghai, Ningbo, are dust, mobile sources, industrial production. Hangzhou start 'ambient air PM2.5 source apportionment ongoing research project' basis in 2013, as the core area of ​​Hangzhou Nankai University in cooperation with the new round of particulate matter source apportionment studies. The results showed: Hangzhou PM2.5 sources, the contribution of local emissions in urban atmosphere PM2.5 concentrations of 62% to 82%, an average of about 72%; urban zone transfer to the ambient air concentrations of PM2.5 contribution accounts for 18% to 38%, an average of about 28%. In urban areas the local source emission contribution of motor vehicles contributed 28.0%, industrial production contributed 22.8%, 20.4% dust, coal 18.8%, other 10.0%. Hangzhou on Saturday under the snow, a shovel a colleague