According to Xinhua News Agency, Beijing, May 25 - Ministry of Environmental Protection released key regional and 74 national urban air quality report in April, Tangshan, Zhengzhou, Jinan, Baoding, Xingtai, Shijiazhuang, Handan, Langfang, Changzhou and Hengshui, as compared with others,relatively poor air quality 10 cities boarded the "list."
 
    Over the same period, according to the urban air quality index evaluation, relatively good air quality in 10 cities are former Haikou, Lhasa, Zhuhai, Xiamen, Huizhou, Zhongshan, Jiangmen, Shenzhen, Zhoushan and Kunming.
 
    Overall, air quality in Beijing, Tianjin in April and last month, last year and last year were all better than the ring, the Yangtze River Delta and Pearl River Delta Regional Air Quality and last year and last month the chain decreased slightly.
 
The number of air quality standards conformed days should be between 24.1 to 76.7 percent in Beijing, Tianjin and 13 urban cities.
(Deflect-o Edition release)