The main source comes from the background load, namely natural background load and upstream contribution load from the upper reaches of the Yangtze River, the Jialing River and the Wujiang River.
污染负荷主要来自长江、嘉陵江、乌江上游的贡献和天然背景负荷。
The main source comes from the background load, namely natural background load and upstream contribution load from the upper reaches of the Yangtze River, the Jialing River and the Wujiang River.
污染负荷主要来自长江、嘉陵江、乌江上游的贡献和天然背景负荷。
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