In March, the air quality ranking of key cities in China announced that Zibo was the worst

China News Agency, Beijing, April 14 (Reporter Ruan Yulin) The Ministry of Ecology and Environment announced on the 14th that the air quality ranking of China's key cities in March this year showed that Zibo, Zaozhuang and Shijiazhuang ranked among the top three cities with the worst air quality in the country.

The Ministry of Ecology and Environment informed the media on the 14th of March and January-March 2020 of the country's ambient air quality. In March of this year, the average ratio of excellent days in 337 cities at the prefecture level and above was 93.5%; the concentration of PM2.5 (fine particles) was 32 micrograms per cubic meter, a year-on-year decrease of 22%. From January to March of this year, the average ratio of good days in 337 cities at the prefecture level and above was 83.5%, and the ambient air quality in 120 cities reached the standard, an increase of 24 year-on-year. The PM2.5 concentration was 46 micrograms per cubic meter, a year-on-year decrease of 14.8% .

In March, among the 168 key cities in China, Zibo, Zaozhuang, Shijiazhuang, Taiyuan, Anyang, Jiaozuo, Linyi, Yangquan, Tangshan, Xingtai and other cities had relatively poor air quality. Lhasa, Haikou, Zhoushan, Zhongshan, Huizhou, Lishui, Shenzhen, Zhangjiakou, Zhuhai, Nanning, Huangshan and other cities have relatively good air quality.

Monitoring shows that in March, the average good days ratio of "2 + 26" cities in Beijing-Tianjin-Hebei and surrounding areas was 83.5%; PM2.5 concentration was 45 micrograms per cubic meter, a year-on-year decrease of 16.7%. From January to March, the average good days ratio of "2 + 26" cities in Beijing-Tianjin-Hebei and surrounding areas was 59.6%, up 10.9 percentage points year-on-year; the PM2.5 concentration was 76 micrograms per cubic meter, down 15.6% year-on-year.

In March, the proportion of excellent days in Beijing was 90.3%, and the PM2.5 concentration was 35 micrograms per cubic meter, a year-on-year decrease of 32.7%. From January to March, the proportion of good days was 81.3%, and the PM2.5 concentration was 52 micrograms per cubic meter, which was flat year-on-year. (Finish)