(ECNS) — Monitoring results on air quality indicate that days with up-to-standard air quality in 74 Chinese cities accounted for 60.1 percent in May, down 3.4 percentage points from the previous month, according to information released by the Ministry of Environmental Protection (MEP) on Wednesday.
Days of substandard air quality accounted for 39.9 percent, including 29.4 percent of days with slight pollution, 8.3 percent with medium pollution, 2.1 percent with heavy pollution and 0.1 percent with severe pollution.
Primary pollutants were PM2.5, PM10 and O3, which exceeded the standard by 20.3 percent, 17.5 percent and 30.4 percent on average, respectively.
According to a comprehensive index assessment of air quality, cities with heavy air pollution include Shijiazhuang, Tangshan, Xingtai, Handan, Jinan, Baoding, Zhengzhou, Beijing, Hengshui and Tianjin, while cities posting better air quality were Haikou, Huizhou, Fuzhou, Zhuhai, Zhoushan, Zhongshan, Shenzhen, Jiangmen, Dongguan and Xiamen.
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