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March 16, pollution process continues, there are seven cities seriously polluted, 13 heavily polluted cities. Beijing, Tianjin and the surrounding area has 53 level and above cities, Baoding serious pollution, Langfang, Beijing, Tangshan, Shijiazhuang, Xingtai and Tianjin six heavily polluted cities, are the primary pollutants PM2.5. Baoding region most heavily polluted, PM2.5日均浓度�\xBA 263 micrograms / cubic meter. Beijing PM2.5日均浓度�\xBA 216 micrograms / cubic meter, the air quality was heavily polluted. Jiaozuo City, central region is heavily polluted, PM2.5日均浓度�\xBA 259 micrograms / cubic meter. Luoyang, Xinxiang, Zhengzhou, Jingmen and Xiangyang six heavily polluted cities, are the primary pollutants PM2.5. Northwest Hotan, Kashi, Atush, Aksu and Zhangye five cities (regions) by dust weather, air quality, severe pollution, heavy pollution in Wuwei City, the primary pollutants are PM10. Among them, the most polluted in Hotan, PM10日均浓度�\xBA 1349 micrograms / cubic meter. As at 12:00 on March 17, there were still 22 urban air quality is maintained at severe and more pollution levels, including Hotan, Kashi, Wuwei, Xingtai and Shijiazhuang five cities (areas) of serious pollution, Handan, Langfang, Attu What, Korla and Aksu and other 17 cities (regions) heavy pollution. Beijing PM2.5 hour concentration of 119 micrograms / cubic meter, air quality, moderately polluted. March 18, atmospheric dispersion conditions are unfavorable to the northern part of Beijing, Tianjin and good air quality to light pollution mainly in central and southern regions mainly moderate to severe pollution, some areas may be a serious pollution. March 19, atmospheric dispersion conditions improved slightly in the northern part of Beijing, Tianjin with good air quality to light pollution mainly in central and southern regions mainly mild to moderate pollution. Recommendation air heavily polluted areas, children, the elderly and people with cardiovascular, respiratory and other vulnerable populations to stay indoors, stop outdoor sports; the general population to reduce outdoor activities and outdoor work time. At the same time, it is recommended the public as much as possible to use public transport to travel, reduce car on the road. Department of Environmental Protection has asked the relevant provinces (municipalities) According to forecasts, the pollution situation closely, ahead of heavy air pollution preparedness work