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Xinhua News Agency, Beijing, May 9 (Reporter Wu Huiying) A few days ago, the Ministry of Ecology and Environment announced the national surface water environmental quality situation in the first quarter of this year, including the ranking of national surface water environmental quality assessment sections in cities at prefecture level and above. What is the water quality of key river basins and lakes (reservoirs) in China? Which areas still need to work hard to improve the water environment? Is the river in your hometown clear? Let's take a look.

The ranking of water environment quality of cities at prefecture level and above was announced for the first time

According to the person in charge of the Ministry of Ecology and Environment, all cities at or above the prefecture level with national surface water assessment cross-sections participated in the ranking of urban water environment quality, and the cross-sections of surface water assessment in 250 countries participated in the ranking.

From January to March this year, the water environment quality of surface water assessment sections in 30 cities such as Ya'an, Laibin and Yunfu was relatively good, while that of 30 cities such as Luliang, Yingkou and Xingtai was relatively poor.

In terms of water quality changes, the results of Lv Liang and Yingkou are not ideal. From January to March this year, the water environment quality of surface water assessment sections in 30 cities, such as Siping, Changchun and Zhongshan, changed relatively well, while that in 30 cities, such as Luliang, Yingkou and Shuozhou, was relatively poor.

It is understood that from the first quarter of this year, the Ministry of Ecology and Environment will carry out quarterly ranking of water environmental quality and changes of national surface water assessment sections in cities at prefecture level and above. The ranking cities cover all cities at prefecture level and above with national surface water assessment sections.

The proportion of inferior class V water quality in important river basins declined

In recent years, comprehensive improvement of water environment and pollution control in important river basins have been continuously promoted in many places, and the quality of water environment has been continuously improved.

From January to March this year, the proportion of water quality section I-III of 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 rivers in the northwest, southwest and Zhejiang-Fujian areas, was 76.3%, up by 6.6 percentage points over the same period, while that of the inferior category V was 6.7%, down by 3.3 percentage points over the same period.

The results show that the main pollution indicators are ammonia nitrogen, chemical oxygen demand and five-day biochemical oxygen demand. The water quality of the rivers in northwest, southwest and Zhejiang and Fujian provinces is excellent. The water quality of the Yangtze River and Pearl River basins is good. The Songhua River, Yellow River, Huaihe River and Haihe River basins are slightly polluted, while the Liaohe River basin is moderately polluted.

Water quality of key lakes and reservoirs is generally rising

From January to March this year, among 98 key lakes (reservoirs) monitored, the number of type I-III water quality lakes and reservoirs accounted for 72.4%, up 7.3 percentage points from the same period last year; the number of poor type V water quality lakes and reservoirs accounted for 3.1%, down 5.4 percentage points from the same period last year. The main pollution indexes affecting Lake (reservoir) water quality are total phosphorus, chemical oxygen demand and pH.

According to the water quality of key lakes and reservoirs in China, Taihu Lake, Chaohu Lake, Dianchi Lake and Baiyangdian Lake are slightly polluted and mildly eutrophic; Erhai Lake is of good quality and moderate nutrition; Danjiangkou Reservoir is of excellent and moderate nutrition.

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