China News Service, October 18th. According to the official WeChat news of the Ministry of Ecology and Environment, the Ministry of Ecology and Environment today announced the state of surface water and ambient air quality throughout the country in September 2021 and January-September.

The overall surface water situation is as follows: In September, among the 3641 national surface water assessment sections, 77.6% of the sections with good water quality (category Ⅰ to Ⅲ) were 77.6%, an increase of 1.8% year-on-year; the proportion of sections inferior to category V was 1.8%, a year-on-year decrease of 1.1 Percentage points.

The main pollution indicators are total phosphorus, permanganate index and chemical oxygen demand.

National surface water quality category ratio in September

　　From January to September, among the 3641 national surface water assessment sections, 81.8% of the sections with good water quality (category I to III) were 81.8%, an increase of 1.2% year-on-year; the proportion of sections inferior to category V was 1.2%, a decrease of 0.9% year-on-year.

The main pollution indicators are chemical oxygen demand, permanganate index and total phosphorus.

Proportion of surface water quality categories nationwide from January to September

Water quality status of main rivers

　　In September, the seven major river basins including the Yangtze River, the Yellow River, the Pearl River, the Songhua River, the Huaihe River, the Haihe River, and the Liaohe River, as well as the Northwest Rivers, Southwest Rivers, and Zhejiang-Fujian Rivers, accounted for 80.3% of sections with good water quality (Class I to III), an increase of 1.7 year-on-year. Percentage points; the proportion of sections inferior to Category V was 1.5%, a year-on-year decrease of 1.0 percentage point.

The main pollution indicators are permanganate index, chemical oxygen demand and total phosphorus.

Among them, the water quality of the rivers in the Northwest, the Yangtze River and the Southwest are excellent; the rivers of Zhejiang and Fujian, the Pearl River, the Yellow River and the Liaohe River are of good water quality; the Songhua River, the Haihe River and the Huaihe River are lightly polluted.

 In September, the water quality categories of the seven major river basins and the rivers in the southwest and northwest, and rivers in Zhejiang and Fujian provinces

　　From January to September, the seven major river basins including the Yangtze River, the Yellow River, the Pearl River, the Songhua River, the Huaihe River, the Haihe River and the Liaohe River, as well as the northwestern, southwestern, and Zhejiang-Fujian rivers have good water quality (class I to III). An increase of 1.2 percentage points; the proportion of sections inferior to category V was 1.0%, a year-on-year decrease of 1.0 percentage point.

The main pollution indicators are chemical oxygen demand, permanganate index and total phosphorus.

Among them, the water quality of the rivers in the northwest and southwest, the Yangtze River Basin and the Zhejiang-Fujian River Basin is excellent; the water quality of the Pearl River, Liaohe River and Yellow River Basin is good; the Huaihe River, Haihe River and Songhua River Basin are lightly polluted.

 From January to September, the water quality categories of the seven major river basins and the rivers in the southwest and northwest, and rivers in Zhejiang and Fujian provinces

Water quality and nutritional status of key lakes (reservoirs)

　　In September, among the 208 key lakes (reservoirs) monitored, the number of lakes and reservoirs with good water quality (Class I to III) accounted for 67.3%, an increase of 0.6% year-on-year; the number of lakes and reservoirs with water quality inferior to Class V accounted for 6.2%. A year-on-year decrease of 1.0 percentage point.

The main pollution indicators are total phosphorus, chemical oxygen demand and permanganate index.

Among the 196 lakes (reservoirs) monitored for nutritional status, 17 were moderately eutrophic, accounting for 8.7%; 44 were mildly eutrophic, accounting for 22.4%; the rest of the lakes (reservoirs) were in a mesotrophic or oligotrophic state.

Among them, Taihu Lake is lightly polluted and mildly eutrophic, and the main pollution index is total phosphorus; Chaohu Lake is moderately polluted and moderately eutrophication, and the main pollution index is total phosphorus; Dianchi Lake is lightly polluted and moderately eutrophication, and the main pollution index is total phosphorus. The pollution indicators are chemical oxygen demand and total phosphorus; Danjiangkou Reservoir and Erhai Lake are both high-quality and medium-nutrient; Baiyangdian Lake is lightly polluted and mildly eutrophic, and the main pollution indicator is chemical oxygen demand.

Compared with the same period last year, the water quality of Dianchi Lake and Erhai Lake has improved, the water quality of Chaohu Lake has declined, and the water quality of Taihu Lake, Danjiangkou Reservoir and Baiyang Lake has no obvious changes; the nutritional status of Chaohu Lake has declined, and the water quality of Taihu Lake, Dianchi Lake, Danjiangkou Reservoir, Erhai Lake and Baiyang Lake has declined. There was no significant change in nutritional status.

　　From January to September, among the 210 key lakes (reservoirs) monitored, the number of lakes and reservoirs with good water quality (category Ⅰ to Ⅲ) accounted for 71.9%, a year-on-year decrease of 0.3%; the number of lakes and reservoirs with poor water quality accounted for 6.2 %, an increase of 0.9% year-on-year.

The main pollution indicators are total phosphorus, chemical oxygen demand and permanganate index.

Among the 209 lakes (reservoirs) monitored for nutritional status, 11 were moderately eutrophic, accounting for 5.3%; 46 were mildly eutrophic, accounting for 22.0%; the rest of the lakes (reservoirs) were in a mesotrophic or oligotrophic state.

Among them, Taihu Lake is lightly polluted and mildly eutrophic, and the main pollution index is total phosphorus; Chaohu Lake is lightly polluted and moderately eutrophication, and the main pollution index is total phosphorus; Dianchi Lake is lightly polluted and moderately The pollution indicators are chemical oxygen demand, total phosphorus and permanganate index; Danjiangkou Reservoir and Erhai Lake are of high quality and moderate nutrition; Baiyangdian Lake is lightly polluted and mildly eutrophic, and the main pollution indicator is chemical oxygen demand.

Compared with the same period last year, the water quality of Dianchi Lake has improved. Taihu Lake, Chaohu Lake, Danjiangkou Reservoir, Erhai Lake and Baiyang Lake have no obvious changes; the nutritional status of Chaohu Lake has declined, and Taihu Lake, Dianchi Lake, Danjiangkou Reservoir, Erhai Lake and Baiyang Lake have no obvious nutrition status. Variety.

National surface water assessment section ranking of cities at prefecture level and above

　　From January to September, among the national prefecture-level and above cities, 30 cities, including Liuzhou, Jiayuguan, and Guilin, have relatively good water environment quality at the national surface water assessment sections (from the 1st to the 30th). Ulanchabu, The water environment quality of the national surface water assessment sections in 30 cities including Chifeng and Luliang City is relatively poor (from the bottom to the 30th place); Ordos, Tongchuan, and Yulin City and other 30 cities in the national surface water assessment section of the water environment quality The changes are relatively good (from the 1st to the 30th), and the water environment quality of the 30 cities including Baotou, Xigaze and Lhasa is relatively poor (from the bottom 1st to the bottom 30th) ).

　　The overall situation of the ambient air is as follows: In September, the average number of good days in 339 prefecture-level and above cities across the country was 91.5%, a decrease of 0.2% year-on-year; the average concentration of PM2.5 was 19 micrograms/m3, a year-on-year decrease of 9.5%; PM10 average The concentration was 37 micrograms/m3, a year-on-year decrease of 11.9%; the average concentration of O3 was 138 micrograms/m3, a year-on-year increase of 3.8%; the average concentration of SO2 was 8 micrograms/m3, a year-on-year decrease of 11.1%; the average concentration of NO2 was 18 micrograms/ Cubic meters, a year-on-year decrease of 18.2%; the average concentration of CO was 0.8 mg/cubic meter, a year-on-year decrease of 11.1%.

　　From January to September, the average number of good days in 339 prefecture-level and above cities across the country was 86.8%, down 0.4% year-on-year; the average PM2.5 concentration was 28 micrograms/m3, down 6.7% year-on-year; the average PM10 concentration was 51 micrograms /M3, the same year-on-year; the average O3 concentration was 142μg/m3, the same The concentration was 1.1 mg/m3, a year-on-year decrease of 8.3%.

Proportion of days at each level in 339 prefecture-level and above cities nationwide from January to September

Concentrations and year-on-year changes of six indicators in 339 prefecture-level and above cities nationwide from January to September

Key area

　　In September, the average number of good days in the “2+26” cities in Beijing-Tianjin-Hebei and surrounding areas was 81.1%, an increase of 7.1 percentage points year-on-year; the PM2.5 concentration was 25 micrograms/m3, a year-on-year decrease of 21.9%.

From January to September, the average number of good days was 64.5%, a year-on-year increase of 2.4 percentage points; the PM2.5 concentration was 40 micrograms/m3, a year-on-year decrease of 18.4%.

　　The proportion of good days in Beijing in September was 90.0%, a year-on-year decrease of 6.7 percentage points; the PM2.5 concentration was 18 micrograms/m3, a year-on-year decrease of 5.3%.

From January to September, the proportion of good days was 75.5%, a year-on-year increase of 1.8 percentage points; the PM2.5 concentration was 33 micrograms/m3, a year-on-year decrease of 5.7%.

　　The average number of good days in September in 41 cities in the Yangtze River Delta region was 80.7%, an increase of 0.6% year-on-year; the PM2.5 concentration was 21 micrograms/m3, a year-on-year decrease of 19.2%.

From January to September, the average number of good days was 86.0%, an increase of 0.7 percentage points year-on-year; the PM2.5 concentration was 28 micrograms/m3, a year-on-year decrease of 12.5%.

　　The average number of good days in the 11 cities in the Fenwei Plain in September was 87.3%, a decrease of 2.4 percentage points year-on-year; the PM2.5 concentration was 21 micrograms/m3, a year-on-year decrease of 36.4%.

From January to September, the average number of good days was 68.0%, a year-on-year decrease of 3.0 percentage points; the PM2.5 concentration was 38 micrograms/m3, a year-on-year decrease of 17.4%.

Ranking of key cities

　　In September, among the 168 key cities, 20 cities including Haikou, Lhasa and Ziyang have relatively good air quality (from 1st to 20th); 20 cities including Taiyuan, Linfen and Tangshan have relatively poor air quality (From bottom to bottom to tied for bottom 19).

　　From January to September, among the 168 key cities, 20 cities including Lhasa, Haikou and Huangshan have relatively good air quality (from 1st to 20th); 20 cities including Linfen, Taiyuan and Tangshan have relatively better air quality Poor (from bottom 1 to bottom 20).

The air quality changes in cities such as Baotou, Hohhot, and Changzhi are relatively good (from first to tied for 19th); the air quality changes in cities such as Guangzhou, Foshan, and Xiangtan are relatively poor (from the bottom to the bottom) 20th place).