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Xingtai, Cangzhou, Changchun, Tangshan, Langfang, Zhengzhou, Dalian, Baoding, Beijing and Tianjin cities 14 standard days for less than 50%. Exceeded the maximum number of days in the primary PM2.5 pollutants for several days, followed by PM10. In November, with the northern region have moved into the heating season, contaminated emissions and adverse weather conditions, Northeast, North China, China appears affecting a wide range of pollution was severe, long duration of heavy air pollution in the process. November 1 to 14, the Northeast region sustained heavy pollution process, the three northeastern provinces a total of 36 prefecture-level and above cities, 34 cities have both been severe and more pollution process, Shenyang consecutive 5 days of severe and more pollution Harbin, Changchun and Anshan and other 12 cities are in a row and more than four days of severe pollution. Among them, Harbin PM2.5 concentrations peak hours close to 1,000 micrograms / cubic meter, Changchun, Shenyang and other cities PM2.5 concentrations peak hours or even extreme peaks in excess of 1000 micrograms / cubic meter. November 27 - December 1, Beijing, Tianjin region sustained heavy air pollution process, the region 13 cities, 10 cities and more than a severe pollution, which Shijiazhuang City air quality for 5 consecutive days for serious pollution ; serious pollution in Beijing four days, one day of severe pollution; Baoding, Langfang and Xingtai and other three cities each appear three days of serious pollution, the two days of severe pollution. Heavy air pollution during the city's largest daily PM2.5 concentration and maximum hourly average concentrations appear in Baoding, respectively, 513 micrograms / cubic meter and 740 micrograms / cubic meter, the maximum point PM2.5 hour concentration of 900 micrograms / cubic meters; maximum Beijing PM2.5 daily average concentration of 464 micrograms / cubic meter, the maximum hourly average concentration of 605 micrograms / cubic meter. Heavy air pollution affected by the process, part of the city's major pollutants PM2.5 monthly average concentration was significantly higher than the same period last year, 74 cities, 10 cities are PM2.5月均浓度较高的前 Harbin, Shenyang, Changchun, Langfang, Xingtai, Shijiazhuang, Beijing, Jinan, Hengshui and Baoding. Urban ambient air quality index evaluation, relatively poor air quality after the 10 cities (from 74th to No. 65), respectively, Shenyang, Xingtai, Baoding, Shijiazhuang, Harbin, Changchun, Langfang, Tangshan, Jinan and Hengshui ; air quality