China News Service, January 29. According to the website of the Ministry of Ecology and Environment, the Ministry of Ecology and Environment announced today the status of the national surface water environment quality in the fourth quarter (October-December) and January-December of 2022.
The report pointed out that from January to December, among the 3,641 national surface water assessment sections, the proportion of sections with good water quality (Class I-III) was 87.9%, an increase of 3.0 percentage points year-on-year.
Overall situation
In the fourth quarter, among the 3,641 national surface water assessment sections, the proportion of sections with good water quality (Class I-III) was 89.6%, a year-on-year increase of 1.6 percentage points; the proportion of sections inferior to Class V was 0.7%, a year-on-year decrease of 0.4 percentage points.
The main pollution indicators are chemical oxygen demand, total phosphorus and permanganate index.
From January to December, among the 3,641 national surface water assessment sections, the proportion of sections with good water quality (Class I-III) was 87.9%, a year-on-year increase of 3.0 percentage points; the proportion of sections inferior to Class V was 0.7%, a year-on-year decrease of 0.5 percentage points.
The main pollution indicators are chemical oxygen demand, permanganate index and total phosphorus.
National surface water quality category ratio from January to December.
Image source: Ministry of Ecology and Environment website
Water quality of major rivers
In the fourth quarter, 91.9% of the sections of the Yangtze River, Yellow River, Pearl River, Songhua River, Huaihe River, Haihe River, Liaohe River, Northwest Rivers, Southwest Rivers, and Zhejiang-Fujian rivers had good water quality (Class I-III) sections, a year-on-year increase. 1.4 percentage points; the proportion of sections inferior to Category V was 0.4%, a year-on-year decrease of 0.5 percentage points.
The main pollution indicators are chemical oxygen demand, permanganate index and five-day biochemical oxygen demand.
Among them, the water quality of the rivers in the northwest, the Yangtze River, the rivers in the southwest, the rivers in Zhejiang and Fujian, the Pearl River and the Yellow River are excellent; the water quality in the Huaihe River, Liaohe River, Songhua River and Haihe River is good.
From January to December, 90.2% of the sections of the Yangtze River, Yellow River, Pearl River, Songhua River, Huaihe River, Haihe River, Liaohe River, Northwest Rivers, Southwest Rivers, and Zhejiang-Fujian Rivers had good water quality (Class I-III) sections, a year-on-year increase of 90.2%. The proportion of sections inferior to Class V was 0.4%, a year-on-year decrease of 0.5 percentage points.
The main pollution indicators are chemical oxygen demand, permanganate index and total phosphorus.
Among them, the water quality of the rivers in Zhejiang and Fujian, the Yangtze River, the Southwest Rivers, the Northwest Rivers and the Pearl River Basin is excellent; the water quality of the Yellow River, Huaihe River and Liaohe River Basin is good; the Haihe River and Songhua River Basin are slightly polluted.
From January to December, the proportion of water quality categories in the seven major river basins, rivers in southwest and northwest, and rivers in Zhejiang and Fujian.
Image source: Ministry of Ecology and Environment website
Water quality and nutritional status of key lakes (reservoirs)
In the fourth quarter, among the 208 key lakes (reservoirs) monitored, the number of lakes and reservoirs with excellent water quality (Class I-III) accounted for 73.6%, a year-on-year increase of 1.0 percentage points; the number of lakes and reservoirs with inferior water quality to Class V accounted for 4.8% , the same as last year.
The main pollution indicators are total phosphorus, chemical oxygen demand and permanganate index.
Among the 189 lakes (reservoirs) monitored for nutritional status, 8 were moderately eutrophic, accounting for 4.2%; 46 were slightly eutrophic, accounting for 24.3%; the remaining lakes (reservoirs) were mesotrophic or oligotrophic.
Among them, Taihu Lake and Chaohu Lake are both slightly polluted and slightly eutrophic, and the main pollution indicators are total phosphorus; Dianchi Lake is slightly polluted and slightly eutrophic, and the main pollution indicators are chemical oxygen demand and total phosphorus; Erhai Lake and Danjiangkou Reservoir The water quality is excellent and moderately nutritious; the water quality of Baiyangdian Lake is good and moderately nutritious.
From January to December, among the 210 key lakes (reservoirs) monitored, the number of lakes and reservoirs with good water quality (Class I-III) accounted for 73.8%, a year-on-year increase of 0.9 percentage points; the number of lakes and reservoirs with inferior water quality to Class V accounted for 4.8% %, a year-on-year decrease of 0.4 percentage points.
The main pollution indicators are total phosphorus, chemical oxygen demand and permanganate index.
Among the 204 lakes (reservoirs) monitored for nutritional status, 12 were moderately eutrophic, accounting for 5.9%; 49 were mildly eutrophic, accounting for 24.0%; the remaining lakes (reservoirs) were mesotrophic or oligotrophic.
Among them, Taihu Lake and Chaohu Lake are both slightly polluted and slightly eutrophic, and the main pollution indicators are total phosphorus; Dianchi Lake is slightly polluted and slightly eutrophic, and the main pollution indicators are chemical oxygen demand and total phosphorus; Erhai Lake and Danjiangkou Reservoir The water quality is excellent and moderately nutritious; the water quality of Baiyangdian Lake is good and moderately nutritious.
The water quality and nutritional status of the six lakes (reservoirs) from January to December.
Image source: Ministry of Ecology and Environment website
Ranking of national surface water assessment sections in prefecture-level and above cities
From January to December, among the cities at prefecture level and above in the country, 30 cities including Liuzhou, Zhangye and Qiandongnan had relatively good water environment quality in the national surface water assessment section (from the first to the 30th), Baicheng, Wujiaqu The water environment quality of surface water assessment sections in Heshihezi and other 30 cities and countries is relatively poor (from the bottom 1 to the bottom 30), see Attached Table 1-2.
The change of water environment quality in national surface water assessment sections of 30 cities such as Luliang, Hohhot and Datong is relatively good (from 1st to 30th), and the water quality of national surface water assessment sections in 30 cities such as Baicheng, Shihezi and Bayannur is relatively good. Changes in environmental quality are relatively poor (from the bottom 1 to the bottom 30).
See Schedule 3 - Schedule 4.
Schedule 1
The top 30 cities and their water bodies in the top 30 cities and water bodies in the water environment quality of national surface water assessment sections from January to December 2022
Schedule 2
The bottom 30 cities and their water bodies in the ranking of the water environment quality of the national surface water assessment section from January to December 2022
Note: The water quality of the water body marked with * in the table meets Class I or Class II of the "Environmental Quality Standards for Surface Water" (GB3838-2002).
Schedule 3
The top 30 cities and their water bodies in terms of water environment quality changes in national surface water assessment sections from January to December 2022
Note: A negative value indicates that the surface water environment quality has improved year-on-year, and a positive value indicates that the quality of the surface water has deteriorated year-on-year.
Schedule 4
The bottom 30 cities and their water bodies in the ranking of water environment quality changes in national surface water assessment sections from January to December 2022
Note: The water quality of the water body marked with * in the table meets Class I or Class II of the "Environmental Quality Standards for Surface Water" (GB3838-2002).