Water Quality - The overall water quality rate for the 345 national and provincial monitoring points in the province reached 99.7%, an increase of 0.3 percentage points year-on-year [1] - Among the monitoring points, 49 were classified as Class I (14.2%), 198 as Class II (57.4%), 97 as Class III (28.1%), and 1 as Class IV (0.3%) [1] - The average concentrations of ammonia nitrogen, chemical oxygen demand, and total phosphorus decreased to 0.117 mg/L, 9.82 mg/L, and 0.058 mg/L, representing year-on-year declines of 3.45%, 0.22%, and 2.08% respectively [1] Air Quality - The average PM2.5 concentration in the province was 26.8 µg/m³, a year-on-year decrease of 6.6%, with a good air quality day rate of 88.4%, up by 1.6 percentage points [2] - Significant differences in PM2.5 concentration improvements were observed among 21 cities, with notable reductions in Zigong (20.4%), Ya'an (17.9%), and Yibin (15%), while increases were seen in Aba Prefecture (23.5%), Deyang (5.4%), and Guang'an (3.4%) [2] - The best air quality was reported in specific counties such as Baoxing County in Ya'an, Pingwu County in Mianyang, and others, while declines were noted in Suining, Guangyuan, and Bazhong [2]
今年前9月全省水质稳中向好 空气质量小幅改善
Si Chuan Ri Bao·2025-10-22 06:54