The monthly average PM2.5 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 ; relatively good air quality in the top 10 cities (from 1 through 10) are in Haikou, Xiamen, Zhoushan, Fuzhou, Guiyang, Huizhou, Lishui, Nanchang, Kunming and Shenzhen. Beijing, Tianjin and 13 urban air quality standards in the ratio of the number of days between 33.3% ~ 90.0%, the ratio of the number of days compliance Zhangjiakou, Qinhuangdao and Chengde three cities in between 80% and 90.0%, standard Handan and Shijiazhuang two cities the proportion of the number of days between 50% to 80%, the ratio of the number of days compliance Hengshui, Xingtai, Cangzhou and other eight cities of less than 50%. Exceeded the maximum number of days in the primary PM2.5 pollutants for several days, followed by PM10. PM2.5月均浓度同比下降 13.0%, the chain increased 56.7%; PM10月均浓度同比下降 23.6%, the chain increased 19.3%; SO2月均浓度同比下降 26.4%, the chain increased 56.0%; NO2月均浓度同比下降7.9%, the chain increased 13.7%; CO exceeded the rate fell 0.2 percentage points, the chain increased 4.4 percentage points; O3 exceeded the rate was flat year on year, a decline of 5.8 percentage points. Beijing standard number of days the proportion of 46.7%, exceeding the number of days in the primary pollutants are PM2.5, which heavily polluted five days, four days of serious pollution and severe pollution and the number of days an increase of more than 4 days. PM2.5月均浓度\xBA 118 μg / m3, an increase of 38.8%, the chain increased 59.5%; PM10月均浓度\xBA 132μg / m3, an increase of 7.3%, the chain increased 53.5%; SO2月均浓度\xBA 12μg / m3, year decrease of 29.4%, the chain increased 100 percent; NO2月均浓度\xBA 61 μg / m3, down 10.3%, the chain increased 13.0%; CO exceeded the daily average rate of 6.7% year on year and were up 6.7 percentage points; O3\xA58 hours max value does not appear excessive, exceeding the rate was flat year on year, a decline of 6.5 percentage points. Yangtze River Delta region 25 urban air quality standards in the ratio of the number of days between 63.3% to 100.0%. Among them, Taizhou, Zhoushan and Qu
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