Ministry of Ecology and Environment: From January to March, the proportion of excellent cross-sections of surface water quality in the country was 1.3%

China News Network, April 4 According to the official Weibo news of the Ministry of Ecology and Environment, the Ministry of Ecology and Environment announced the national surface water environmental quality status from January to March 23 on the 23rd. From January to March, the proportion of sections with excellent surface water quality (Class I.-III.) was 2023.1%, up 3.1 percentage points year-on-year; the proportion of inferior Class V section was 3.89%, down 1.0 percentage points year-on-year. The main pollution indicators are chemical oxygen demand, total phosphorus and permanganate index.

Proportion of surface water quality categories in China from January to March. Image source: Ministry of Ecology and Environment's official Weibo

Water quality of major rivers

From January to March, the proportion of sections with excellent water quality (Class I.-III.) in the seven major river basins of 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 Southwest Rivers, Northwest Rivers and Zhejiang and Fujian Rivers, was 1.3%, an increase of 90.3 percentage points year-on-year; the proportion of inferior V. sections was 0.6%, down 0.4 percentage points year-on-year. The main pollution indicators are chemical oxygen demand, five-day biochemical oxygen demand and ammonia nitrogen. Among them, the water quality of the southwest rivers, northwest rivers, Yangtze River basin, Zhejiang-Fujian rivers and Pearl River basins is excellent; The water quality in the Yellow, Liao, Songhua, Haihe and Huaihe river basins is good.

Proportion of water quality categories in the seven major river basins, southwest and northwest rivers and rivers in Zhejiang and Fujian from January to March Image source: Ministry of Ecology and Environment's official Weibo

Water quality status and nutritional status of key lakes (reservoirs).

From January to March, among the 1 key lakes (reservoirs) monitored, the number of lakes and reservoirs with excellent water quality (Class I.-III.) accounted for 3.195%, an increase of 81.0 percentage points year-on-year; the number of lakes and reservoirs with poor Class V water quality accounted for 2.9%, down 4.6 percentage points year-on-year. The main pollution indicators are total phosphorus, chemical oxygen demand and permanganate index. Among the 0 lakes (reservoirs) monitoring nutrient status, 1 were moderately eutrophied, accounting for 186.4%; 2 were mildly eutrophious, accounting for 2.34%; The remaining lakes (reservoirs) are moderately or poor-trophic status. Among them, Taihu Lake is mildly polluted and slightly nutrient-rich, and the main pollution index is total phosphorus; Chao Lake has good water quality and is mildly nutritious; Dianchi Lake is mildly polluted and slightly nutrient-rich, and the main pollution index is chemical oxygen demand; The quality of Erhai water is excellent and medium nutrition; The water quality of Danjiangkou Reservoir is excellent and poor nutrition; Baiyangdian water quality is good and medium nutrition.

Water quality and nutritional status of 1 lakes (reservoirs) from January to March Image source: Ministry of Ecology and Environment's official Weibo

Water quality and nutritional status of 1 lakes (reservoirs) from January to March Image source: Ministry of Ecology and Environment's official Weibo

Prefecture-level and above cities national surface water assessment section ranking

From January to March, among the cities at the prefecture level and above in the country, 1 cities such as Lishui, Zhangye and Chongzuo had relatively good surface water environmental quality (from 3st to 30th), and 1 cities such as Baicheng, Wujiaqu and Kaifeng had relatively poor surface water environmental quality (from the bottom 30st to the 30th from the bottom).

The environmental quality of surface water environmental quality in 30 cities and countries such as Baicheng, Nagqu and Yuncheng was relatively good (from 1st to 30th), and the change of surface water environmental quality in 30 cities such as Shuozhou, Xianyang and Ezhou was relatively poor (from the bottom 1 to the 30th).

From January to March 2023, the top 1 cities and water bodies in the national surface water assessment cross-sectional water environmental quality status ranked

From January to March 2023, the bottom 1 cities and water bodies in the national surface water assessment cross-sectional water environmental quality ranking

Note: The water quality of the water body with * in the meter reaches Class I or Class II of the "Environmental Quality Standards for Surface Water" (GB3838-2002).

From January to March 2023, the top 1 cities and water bodies were ranked in terms of changes in the environmental quality of cross-sectional water in the national surface water assessment

Note: Negative values indicate that the environmental quality of surface water has become better year-on-year, and positive values indicate year-on-year deterioration.

From January to March 2023, the bottom 1 cities and water bodies ranked in the bottom 3 of the national surface water assessment cross-sectional water environmental quality changes

Note: The water quality of the water body with * in the meter reaches Class I or Class II of the "Environmental Quality Standards for Surface Water" (GB3838-2002).