China News Service, June 18. According to the official WeChat news of the Ministry of Ecology and Environment, the Ministry of Ecology and Environment notified the media on the 18th of the national ambient air quality in May and January-May 2022.

In May, the average number of days with good air quality in 339 cities at the prefecture level and above was 85.2%, a year-on-year decrease of 2.6 percentage points.

Overall situation

　　In May, the average number of days with good air quality in 339 cities at the prefecture level and above was 85.2%, a year-on-year decrease of 2.6 percentage points; the average PM2.5 concentration was 22 micrograms/m3, the same year-on-year; the average PM10 concentration was 45 micrograms/cubic m, a year-on-year decrease of 4.3%; the average concentration of O3 was 153 micrograms/cubic meter, a year-on-year increase of 7.0%; the average concentration of SO2 was 8 micrograms/cubic meter, flat year-on-year; the average concentration of NO2 was 18 micrograms/cubic meter, a year-on-year decrease of 5.3%; The average CO concentration was 0.7 mg/m3, a year-on-year decrease of 12.5%.

　　From January to May, the average number of days with good air quality in 339 cities at the prefecture level and above was 85.1%, an increase of 0.5 percentage points year-on-year; the average PM2.5 concentration was 35 micrograms/m3, a year-on-year decrease of 5.4%; the average PM10 concentration was 59 micrograms/m3, down 9.2% year-on-year; the average concentration of O3 was 138 micrograms/m3, up 8.7% year-on-year; the average SO2 concentration was 9 micrograms/m3, down 10.0% year-on-year; the average NO2 concentration was 23 micrograms/m3 , a year-on-year decrease of 8.0%; the average CO concentration was 1.2 mg/m3, which was the same year-on-year.

From January to May 2022, the proportion of days at each level in 339 cities at the prefecture level and above

Concentrations and year-on-year changes of six indicators in 339 prefecture-level and above cities across the country from January to May 2022

key area

　　In May, the average number of good days in the “2+26” cities in Beijing-Tianjin-Hebei and surrounding areas was 62.0%, a year-on-year decrease of 1.7 percentage points; the PM2.5 concentration was 28 micrograms/m3, a year-on-year decrease of 15.2%; the average O3 concentration was 190 micrograms per cubic meter, up 6.7% year-on-year.

From January to May, the average number of days with good quality was 66.8%, up 3.5 percentage points year-on-year; the PM2.5 concentration was 51 micrograms/m3, down 3.8% year-on-year; the average O3 concentration was 162 micrograms/m3, up 12.5% ​​year-on-year.

　　The proportion of good days in May in Beijing was 61.3%, a year-on-year decrease of 12.9 percentage points; the PM2.5 concentration was 21 micrograms/m3, a year-on-year increase of 5.0%; the average O3 concentration was 211 micrograms/cubic meter, a year-on-year increase of 27.9%.

From January to May, the proportion of good days was 81.5%, an increase of 13.3 percentage points year-on-year; the PM2.5 concentration was 33 μg/m3, a year-on-year decrease of 28.3%; the average O3 concentration was 163 μg/m3, a year-on-year increase of 28.3%.

　　The average number of good days in 41 cities in the Yangtze River Delta region in May was 73.2%, a year-on-year decrease of 9.8 percentage points; the PM2.5 concentration was 26 micrograms/m3, a year-on-year increase of 4.0%; the average O3 concentration was 177 micrograms/cubic meter, a year-on-year increase 8.6%.

From January to May, the average number of days with good quality was 80.8%, a year-on-year decrease of 7.0 percentage points; the PM2.5 concentration was 38 micrograms/m3, a year-on-year increase of 5.6%; the average O3 concentration was 156 micrograms/cubic meter, a year-on-year increase of 13.9%.

　　The average number of good days in 11 cities in the Fenwei Plain in May was 70.4%, up 0.9 percentage points year-on-year; the PM2.5 concentration was 26 micrograms/m3, down 13.3% year-on-year; the average O3 concentration was 176 micrograms/m3, down year-on-year 3.3%.

From January to May, the average number of days with good quality was 61.8%, a year-on-year decrease of 4.5 percentage points; the PM2.5 concentration was 56 micrograms/cubic meter, a year-on-year increase of 7.7%; the average O3 concentration was 151 micrograms/cubic meter, a year-on-year increase of 12.7%.

Comparison of air quality in the country and key regions from January to May 2022

Ranking of key cities

　　In May, among the 168 key cities, 20 cities including Haikou, Lhasa, and Guiyang had relatively good air quality (from 1st to 19th); Taiyuan, Tangshan, Yangquan and other cities had relatively poor air quality ( From the 1st from the bottom to the 19th from the bottom), see Appendix 1.

　　From January to May, among the 168 key cities, 20 cities including Haikou, Lhasa and Zhoushan had relatively good air quality (from 1st to 20th); 20 cities including Xianyang, Xi'an and Urumqi had relatively good air quality Poor (from bottom 1 to tied for bottom 19), see Schedule 2.

Schedule 1

List of the top 20 and bottom 20 cities in the air quality ranking of 168 key cities in May 2022

Schedule 2

List of top 20 and bottom 20 cities in air quality rankings of 168 key cities from January to May 2022