上海生态环境状况公报发布 AQI优良率达88.5% 臭氧优化最明显

Group 1 - The 2024 Shanghai Ecological Environment Status Bulletin indicates that the annual average concentration of PM2.5 in Shanghai remained stable at 28 micrograms per cubic meter, meeting the national secondary air quality standard, unchanged from 2023 [1] - The annual average concentrations of PM10 and nitrogen dioxide are projected to decrease by 10.4% and 3.2% respectively compared to 2023, while sulfur dioxide and carbon monoxide levels remain unchanged [1] - The most significant improvement is observed in ozone levels, with the 90th percentile of the daily maximum 8-hour average ozone concentration recorded at 144 micrograms per cubic meter, the lowest value in five years [1] Group 2 - In 2024, Shanghai experienced 323 days of good air quality, achieving an 88.5% good rate, which is an increase of three days compared to 2023, with no severe pollution days recorded throughout the year [1] - The quality of surface water in Shanghai continues to improve, with 99.3% of monitored river and lake sections classified as Class II to III, and Class V sections have been absent for three consecutive years [2] - The average concentration of total phosphorus in major river and lake sections decreased by 2.3% to 0.128 milligrams per liter, and the average permanganate index fell by 2.8% to 3.5 milligrams per liter compared to 2023 [2] Group 3 - Shanghai has completed a comprehensive investigation of biodiversity, involving over 4,000 participants from various sectors, with approximately 80% of field surveys completed, and the discovery of one new species and 149 new recorded species [2]