基于不同时间尺度综合指数贡献率的攀枝花市大气污染特征分析

选取2016—2022年攀枝花市环境空气质量监测数据，基于年度、季度、月度、小时时间尺度评价环境空气质量综合指数贡献率。结果表明，攀枝花市污染类型已由传统的单一工业型污染转变为复合型污染，且污染物在不同时间尺度下的分布特征明显。从季度尺度来看，第一季度细颗粒物(PM_2.5)综合指数贡献率较大，第二和第三季度臭氧(O₃)综合指数贡献率较大，第四季度二氧化氮(NO₂)及PM_2.5综合指数贡献率较大。从月度尺度来看，O₃在3—8月的贡献较大，PM_2.5、NO₂、可吸入颗粒物(PM₁₀)、一氧化碳(CO)、二氧化硫(SO₂)在1—2月及11—12月的贡献较大。从小时尺度来看，O₃在13—19点贡献较大，PM₁₀、PM_2.5、CO在8—13点贡献较大，SO₂在9—13点贡献较大，NO₂在8—1...

Analysis of Air Pollution Characteristics in Panzhihua City Based on Different Time Scale of the Composite Index Contribution Rate

The ambient air quality monitoring data of Panzhihua City from 2016 to 2022 were selected to evaluate the contribution rate of the ambient air quality comprehensive index based on the annual,quarterly,monthly and hourly time scales.The results showed that pollution type of Panzhihua City had gradually changed from traditional single industrial pollution to compound pollution,and the distribution characteristics of pollutants at different time scales were obvious. At the quarterly scale,the composite index contribution rate of PM_2.5 in the first quarter,O₃ in the second and third quarters,NO₂ and PM_2.5 in the fourth quarter was larger.O₃ contributed more in March-August.The contributions of PM_2.5,NO₂,PM₁₀,CO and SO₂ were greater in January-February and November-December.At the hourly scale,O₃ contributed more from 13 to 19 o''clock,PM₁₀,PM_2.5 and CO contributed more from 8 to 13 o''clock,SO₂ contributed more from 9 to 13 o''clock,and NO₂ contributed more from 8 to 12 o''clock and 20 to 24 o''clock.Based on the above research results,this paper suggested that Panzhihua should implement air pollution prevention and control according to different time scales in order to further reduce the comprehensive index of ambient air quality and improve the ranking of urban air quality.