The water quality of Baiyangdian Lake in North China has improved over the past decade due to human activities. By analyzing water quality data from 2006 to 2016, researchers found that factors like water temperature and fluoride play a significant role in determining water quality. Different parts of the lake are affected by different types of pollution, with pollution being a more significant factor than natural influences. Environmental water allocation to the lake has also been shown to improve water quality. These findings help us understand how human activities impact water quality in lakes like Baiyangdian, which is crucial for the ecosystem in highly populated regions.