China News Service, May 18, according to the WeChat public account of the Ministry of Ecology and Environment, the Ministry of Ecology and Environment today notified the state of surface water and ambient air quality in April and January-April 2020: January-April, 1940 national surface water Among the assessment sections, the proportion of sections with good water quality (category Ⅰ-Ⅲ) was 81.2%, up 6.2 percentage points year-on-year. From January to April, the proportion of average good days in 337 prefecture-level cities and above was 84.8%, an increase of 5.0 percentage points year-on-year; the ambient air quality of 129 cities reached the standard, an increase of 26 year-on-year.

Data map: Hangzhou Yuanhuaxi Yuanyang playing in the water. Photo by Wang Wenjie

General situation of surface water

　　In April, among the 1940 national surface water assessment sections, the proportion of sections with good water quality (category I-III) was 80.9%, an increase of 6.8 percentage points year-on-year; the ratio of inferior category V sections was 2.2%, a decrease of 3.7 percentage points year-on-year. The main pollution indicators are chemical oxygen demand, permanganate index and total phosphorus.

　　Proportion of national surface water quality categories in April 2020

　　From January to April, among the 1940 national surface water assessment sections, the proportion of sections with good water quality (category I-III) was 81.2%, an increase of 6.2% year-on-year; the ratio of inferior class V sections was 1.4%, a decrease of 4.1% year-on-year. The main pollution indicators are chemical oxygen demand, total phosphorus and permanganate index.

　　Proportion of national surface water quality categories from January to April 2020

Water quality of major rivers

　　In April, 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 rivers, southwestern rivers, and Zhejiang-Fujian Rivers had a water quality section ratio of 83.0%, up 7.2 percentage points year-on-year; The inferior category V was 1.7%, a year-on-year decrease of 4.6 percentage points. The main pollution indicators are chemical oxygen demand, permanganate index and five-day biochemical oxygen demand. Among them, the water quality in the northwestern rivers, the Yangtze River Basin, the southwestern rivers and the Zhejiang-Fujian Rivers is excellent, the water quality in the Pearl River, Yellow River and Songhua River basins is good, and the Huaihe, Haihe and Liaohe river basins are lightly polluted.

　　Water quality of the seven major river basins and the rivers in the southwest and northwest and rivers in Zhejiang and Fujian in April 2020

　　From January to April, the proportion of water quality in 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 rivers, southwestern rivers, and Zhejiang-Fujian Rivers, in grades I-III, was 84.5%, up 7.2 Percentage point; inferior category V is 1.2%, a year-on-year decrease of 4.9 percentage points. The main pollution indicators are chemical oxygen demand, permanganate index and ammonia nitrogen. Among them, the water quality in the northwestern rivers, the Yangtze River Basin, the Zhejiang-Fujian Rivers, the southwestern rivers and the Pearl River Basin is excellent, the water quality in the Yellow River and Huaihe River Basins is good, and the Songhua River, Haihe River and Liaohe River Basins are lightly polluted.

　　The water quality of the seven major river basins and the southwest and northwest rivers and the rivers in Zhejiang and Fujian from January to April 2020

Water quality and nutritional status of important lakes (reservoirs)

　　In April, among the 112 key lakes (reservoirs) monitored, Class I-III water quality lakes accounted for 79.5%, up 11.1 percentage points year-on-year; inferior V water quality lakes accounted for 7.1%, year-on-year An increase of 1.0 percentage points. The main pollution indicators are total phosphorus, chemical oxygen demand and permanganate index. Of the 96 key lakes (reservoirs) monitoring the eutrophication status, 4 lakes (reservoirs) were moderately eutrophic, accounting for 4.2%; 13 lakes (reservoirs) were mildly eutrophic, accounting for 13.5%; the rest The lake (bank) is not eutrophic. Among them, Taihu Lake is light pollution and light eutrophication, the main pollution index is total phosphorus; Chaohu Lake has good water quality and light eutrophication; Dianchi Lake is moderate pollution, moderate eutrophication, the main pollution indicators are chemical oxygen demand, total Phosphorus and permanganate index; Erhai water quality is good and nutritious; Danjiangkou reservoir water quality is excellent and poor nutrition; Baiyangdian water quality is good and moderate nutrition. Compared with the same period of last year, the water quality of Chaohu Lake and Baiyangdian Lake has improved, while the water quality of Dianchi Lake and Er'er Lake has declined, and the water quality of Taihu Lake and Danjiangkou Reservoir has not changed significantly; There was no significant change in the nutrition status of Chaohu Lake and Erhai Lake.

　　From January to April, among the 112 key lakes (reservoirs) monitored, the number of Class I-III water quality lakes accounted for 73.2%, up 1.4 percentage points year-on-year; the number of inferior Class V water quality lakes accounted for 5.4% , A year-on-year increase of 1.5 percentage points. The main pollution indicators are total phosphorus, chemical oxygen demand and permanganate index. Of the 108 key lakes (reservoirs) monitoring the eutrophication status, 4 lakes (reservoirs) were moderately eutrophic, accounting for 3.7%; 17 lakes (reservoirs) were mildly eutrophic, accounting for 15.7%; the rest The lake (bank) is not eutrophic. Among them, Taihu Lake is light pollution and light eutrophication, the main pollution index is total phosphorus; Chaohu Lake has good water quality and light eutrophication; Dianchi Lake is light pollution and light eutrophication, the main pollution indicators are chemical oxygen demand and total Phosphorus; the water quality of Erhai Lake and Danjiangkou Reservoir is excellent and moderately nutritious; the water quality of Baiyangdian is good and moderately nutritious. Compared with the same period of last year, the water quality of Chaohu Lake, Erhai Lake and Baiyangdian Lake has improved, and the water quality of Taihu Lake, Dianchi Lake and Danjiangkou Reservoir has not changed significantly; the nutritional status of Baiyangdian Lake has improved, and that of Taihu Lake, Chaohu Lake, Dianchi Lake, Erhai Lake and Danjiangkou Reservoir has not changed significantly.

Ranking of national surface water assessment sections at prefecture level and above

　　The participating prefecture-level cities at the national level and above cover 2,050 state-controlled sections (of which 1940 are national surface water assessment sections and 110 are sea-controlling sections). In April, among the cities at prefecture level and above, 30 cities including Yushu, Heyuan and Liuzhou had relatively good surface water quality (from 1st to 30th), and 30 cities including Cangzhou, Tongchuan and Liaoyuan The surface water quality of urban national surface water assessment is relatively poor (from the last to the last 30); from January to April, among the cities at the prefecture level and above, 30 cities including Yushu, Liuzhou, Jinchang, etc. The water environment quality of the assessment section is relatively good (from 1st to 30th), and the surface water assessment quality of the surface water assessment of 30 cities such as Tongchuan, Cangzhou and Xingtai is relatively poor (from the last to the 30th) ).

Ambient air

　　In April, the proportion of average good days in 337 prefecture-level cities and above was 88.7%, a decrease of 0.1 percentage point year-on-year; the PM2.5 concentration was 33 micrograms / cubic meter, an increase of 3.1 percent year-on-year; the PM10 concentration was 63 micrograms / cubic meter, Year-on-year; O3 concentration was 146 micrograms / cubic meter, up 8.1% year-on-year; SO2 concentration was 10 micrograms / cubic meter, flat year-on-year; NO2 concentration was 26 micrograms / cubic meter, up 4.0% year-on-year; CO concentration was 0.9 mg / cubic meter Rice, a year-on-year decrease of 10.0%.

　　From January to April, the proportion of average good days in 337 prefecture-level and higher cities nationwide was 84.8%, an increase of 5.0 percentage points year-on-year; the ambient air quality of 129 cities reached the standard, an increase of 26 year-on-year; the PM2.5 concentration was 42 μg / m3 , A year-on-year decrease of 12.5%; PM10 concentration of 65 μg / m3, a decrease of 17.7% year-on-year; O3 concentration of 123 μg / m3, an increase of 3.4% year-on-year; SO2 concentration of 11 μg / m3, a decrease of 15.4% year-on-year; NO2 concentration It is 25 micrograms / cubic meter, down 16.7% year-on-year; CO concentration is 1.4 milligrams / cubic meter, down 6.7% year-on-year.

　　Proportion of days in various cities of 337 prefecture-level and above nationwide from January to April 2020

　　From January to April 2020, the concentration and year-on-year change of the six indicators of 337 cities at the prefecture level and above

　　In April, the average good days ratio of "2 + 26" cities in Beijing-Tianjin-Hebei and surrounding areas was 80.5%, an increase of 14.9 percentage points year-on-year; PM2.5 concentration was 39 micrograms per cubic meter, a year-on-year decrease of 25.0%. From January to April, the average good days ratio was 64.8%, an increase of 11.9 percentage points year-on-year; PM2.5 concentration was 67 micrograms / cubic meter, a decrease of 17.3% year-on-year.

　　The proportion of excellent days in Beijing in April was 83.3%, up 16.6 percentage points year-on-year; the PM2.5 concentration was 31 micrograms / cubic meter, down 35.4% year-on-year. From January to April, the ratio of good days was 81.8%, an increase of 11.8 percentage points year-on-year; the PM2.5 concentration was 47 micrograms / cubic meter, a decrease of 7.8% year-on-year.

　　The average fine days ratio of 41 cities in the Yangtze River Delta region in April was 88.4%, a year-on-year decrease of 2.7 percentage points; PM2.5 concentration was 35 micrograms per cubic meter, a year-on-year decrease of 7.9%. From January to April, the proportion of average good days was 86.6%, an increase of 10.9 percentage points year-on-year; PM2.5 concentration was 42 μg / m3, a decrease of 23.6% year-on-year.

　　The average fine days ratio of 11 cities in Fenwei Plain in April was 87.6%, an increase of 14.0 percentage points year-on-year; PM2.5 concentration was 37 μg / m3, a decrease of 21.3% year-on-year. From January to April, the average good days ratio was 65.3%, an increase of 13.0 percentage points year-on-year; PM2.5 concentration was 66 micrograms / cubic meter, a year-on-year decrease of 20.5%.

　　In April, among the 168 key cities, the air quality of Changchun, Harbin, Shenyang and other cities was relatively poor (from the last to the 19th), and the air quality of Lhasa, Haikou, Ya'an and other cities was relatively good (from 1st to 20th place, see Schedule 5).

　　From January to April, the air quality of 168 key cities such as Shijiazhuang, Baotou, and Anyang was relatively poor (from the last to the 20th), and the air quality of cities such as Haikou, Lhasa, and Lishui was relatively good (From 1st to 20th place, see Schedule 6).

　　Schedule 1:

　　The top 30 cities and their water bodies in the national surface water assessment cross-sectional water environment quality status in April 2020

　　Schedule 2:

　　The top 30 cities and their water bodies in the ranking of the water environment quality status of the national surface water assessment cross-section in April 2020

　　Schedule 3:

　　The top 30 cities and their water bodies in the state of the surface water quality of the national surface water assessment section from January to April 2020

　　Schedule 4:

　　The top 30 cities and their water bodies in the ranking of the state of the water environment quality of the national surface water assessment section from January to April 2020

　　Schedule 5:

　　The list of the top 20 and the bottom 20 cities in the ambient air of 168 key cities in April 2020

　　Schedule 6:

　　From January to April 2020, 168 key cities are ranked in the top 20 and the bottom 20 cities