National air quality ranking

The national air quality rankings are Haikou, Zhuhai, Lishui, Huangshan, Shenzhen, Zhongshan, Lhasa, Xiamen, Zhoushan and Taizhou.

From July 2065438 to July 2009, the average number of excellent days in 337 cities at prefecture level and above was 85.4%, down 6.9 percentage points year-on-year; The concentration of PM2.5 is 20 μ g/m3, which is flat year-on-year; The concentration of PM 10 was 40 μ g/m3, up 5.3% year-on-year. O3 concentration was 146 μ g/m3, up 8.1%year-on-year; SO2 concentration was 8 μ g/m3, down 1 1. 1% year-on-year.

20 19 July, 168 Among the key cities, 20 cities such as Tangshan, Jincheng and Xingtai have poor air quality (168 to149); The air quality in 20 cities such as Haikou, Zhuhai and Lishui is relatively good (from 1 to 20).

Air environment in Beijing, Tianjin and Hebei

The average number of excellent days in July in "2+26" cities in Beijing, Tianjin and Hebei and its surrounding areas was 38.6%, down 28.7 percentage points year-on-year, and the main pollutant was O3. The concentration of PM2.5 was 34 μ g/m3, down 2.9% year-on-year. The proportion of excellent days in July in Beijing was 38.7%, down 25.8 percentage points year-on-year, and the main pollutant was O3. The concentration of PM2.5 was 37 μ g/m3, down 15.9% year-on-year.

The average number of excellent days in July in the Yangtze River Delta region of 4 1 city was 8 1.9%, down 9.9 percentage points year-on-year; The concentration of PM2.5 was 23 μ g/m3, up 9.5% year-on-year. The average number of excellent days in Wei Fen Plain 1 1 city in July was 57.2%, down by 20.8 percentage points year-on-year, and the main pollutant was O3. The concentration of PM2.5 was 25 μ g/m3, down 19.4% year-on-year.