生态环境质量持续改善，优良天数比例达87.2% 美丽中国建设迈出重大步伐

Group 1 - The core viewpoint of the article emphasizes the significant progress made in ecological environment protection and high-quality development during the "14th Five-Year Plan" period, highlighting a shift from pollution prevention to comprehensive construction of a beautiful China [1][2][4] Group 2 - The pollution prevention campaign has achieved new results, with PM2.5 concentration in cities expected to drop to 29.3 micrograms per cubic meter by 2024, a 16.3% decrease from 2020, and the proportion of good air quality days reaching 87.2%, up 2.4 percentage points from 2020 [2] - The blue sky protection campaign has seen PM2.5 concentrations in key regions like Beijing-Tianjin-Hebei and the Yangtze River Delta decrease by 18% and 10% respectively compared to 2020 [2] - The water quality improvement initiative has led to over 90% of surface water quality monitoring points achieving good water quality for the first time [2] Group 3 - Green and low-carbon development has made new strides, with 1.12 billion kilowatts of coal power units and 950 million tons of crude steel capacity undergoing ultra-low emission transformations [3] - The establishment of the world's largest carbon trading market covers over 60% of national carbon emissions, enhancing the internal motivation and innovative vitality for green development [3] Group 4 - A robust policy framework has been developed to promote high-level protection and foster new productive forces, with a significant decrease in environmental impact assessments for high-emission projects and an increase in assessments for renewable energy projects [4][5] - The ecological environment management system has been established, categorizing over 40,000 control units into three types: priority protection, key control, and general control [4] Group 5 - The green finance sector has been advanced, with over 100 projects receiving financial support amounting to 216.4 billion yuan, facilitating the transition to a low-carbon economy [6] - The national carbon market has seen a cumulative trading volume of 714 million tons and a total transaction value of 48.961 billion yuan as of September 18 [7]