生态环境质量持续向好

Group 1 - The air quality in Haidong City has significantly improved, with a projected annual air quality excellent rate of 95.2% by 2025, an increase of 0.9 percentage points from the previous year [1] - PM2.5 concentration is expected to be 27 micrograms per cubic meter, a decrease of 6.9% compared to the previous year, marking the best air quality in history [1] - The city has implemented ultra-low emission transformations for cement plants and comprehensive smoke governance for 19 ferroalloy enterprises, effectively addressing outdoor burning pollution [1] Group 2 - The city has invested 540 million yuan in a wetland purification project for urban sewage treatment plants, with 81% of drinking water source protection areas being standardized [2] - The water quality of major rivers has been stable, with the Yellow River and Datong River maintaining Class I water quality, and the Huangshui River achieving Class II water quality, with a 100% compliance rate for water environment quality for six consecutive years [1][2] - The city has established a positive list system for ecological environment supervision and implemented a non-site regulatory enforcement system focused on automatic monitoring of pollution sources, enhancing the business environment and reducing the burden on enterprises [2]