Core Viewpoint - The water quality of Baiyangdian has significantly improved from a grade of inferior V to a stable grade III, indicating successful ecological restoration efforts in the region [2][4]. Group 1: Water Quality Improvement - Baiyangdian's water quality was previously classified as inferior V, characterized by deep green, turbid water with an unpleasant odor [2]. - Following the establishment of the Xiong'an New Area in 2017, systematic ecological protection measures were implemented, leading to a rise in water quality to grade III, which has been stable since 2021 [3][4]. - The number of national monitoring points increased from 5 to 8, with sampling frequency raised to twice a week, enhancing the ability to detect and address water quality issues promptly [2][3]. Group 2: Biodiversity Recovery - The ecological recovery has led to an increase in wild bird species in Baiyangdian to 296, up by 90 species since the establishment of the Xiong'an New Area [4]. - The number of wild fish species has also risen to 48, an increase of 21 species compared to before the establishment of the new area [4]. - The discovery of the May Fourth midge, a typical indicator species for clean water, signifies ongoing improvements in the water ecosystem [4]. Group 3: Monitoring and Efforts - The monitoring team has faced challenges such as personnel shortages and outdated equipment, but recent upgrades have significantly improved efficiency, allowing for quicker analysis of water samples [3][5]. - Continuous efforts by dedicated environmental workers, like Liu Dongmei, have been crucial in documenting and supporting the water quality improvement process [5].