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Standard number of days the proportion of three cities is 100% compliance the number of days the proportion of Wenzhou, Lishui and Hangzhou nine cities for between 80% and 100% compliance the number of days the proportion of Taizhou, Changzhou and Suzhou and other 13 cities in between 63.3% and 80%. Exceeded the maximum number of days in the primary PM2.5 pollutants for several days, followed by NO2. PM2.5月均浓度同比下降 17.5%, unchanged; PM10月均浓度同比下降 23.5%, a decline of 14.8%; SO2月均浓度同比下降 25.9%, a decline of 9.1%; 12.5% ​​NO2月均浓度同比下降, the chain increased 5.0%; CO daily average exceeded the average rate of year on year and the chain are flat; O3日最�\xA7 value exceeding eight hours rate rose 0.1 percentage points year on year, a decline of 15.3 percentage points. Pearl River Delta Region 9 urban air quality standards in the ratio of the number of days between 90% to 100%. Wherein the ratio of the number of days compliance Huizhou, Jiangmen, Guangzhou and other four cities is 100% standard percentage of days Dongguan, Zhongshan and Zhaoqing and other five cities for between 90% to 100%. Each half of the number exceeded the number of days to O3 and PM2.5 primary pollutants days. PM2.5月均浓度同比下降 26.0%, a decline of 14.0%; PM10月均浓度同比下降 15.7%, a decline of 9.2%; SO2月均浓度同比下降 21.1%, unchanged; NO2月均浓度同比下降 5.0% , the chain increased 8.6%; CO daily average exceeded the average rate of year on year and the chain are flat; O3日最�\xA7 eight hours average value exceeded the rate fell 2.6 percentage points, a decline of 12.5 percentage points. Luo Yi said that, overall, Beijing, Tianjin and 13 cities, compared with the same period last year, Beijing, Zhangjiakou and Langfang three cities PM2.5月均浓度均明显上�\x87, 10 other cities PM2. May average concentration has declined; the chain last month, 13 cities PM2.5, PM10, SO2 and CO NO2月均浓度�\x8A excessive rate increased significantly. Yangtze River Delta, Pearl River Delta Regional Air Quality year and the chain has been reduced. And the concentration of major pollutants year, the Yangtze River Delta region PM2.5, PM10, SO2 and NO2 and so last year were significantly decreased; and the chain last month, PM10 and SO2 concentrations have decreased, PM2.5 concentration unchanged, NO2 concentration rises, O3 exceeded the rate of decline. Pearl River Delta region PM2.5 and PM10 concentrations year and the chain has declined, SO2 concentrations decreased year on year, unchanged, NO2 concentrations fell, the chain increased, O3 excessive rates with