绵阳市2020~2023年大气颗粒物污染浓度特征分析

Characteristics of Atmospheric Particulate Pollution Concentration in Mianyang City from 2020 to 2023

基于绵阳市2020年1月~2023年2月大气颗粒物和空气质量指数(AQI)的数据,为了分析绵阳市大气颗粒物污染的特征,运用SPSS对绵阳市的空气质量指数和大气颗粒物进行特征分析。结果显示,2020~2022年空气质量指数月均特征呈现“W”型变化趋势,2022年空气质量指数月均值范围为30~100,2022年空气质量优良占比为89.59%,空气质量较好;大气颗粒物的月均浓度呈“U”型变化,大气颗粒物浓度在1月、12月最高,7月、8月最低;大气颗粒物浓度季节变化趋势由高到低为冬季>春季>秋季>夏季;年均浓度均低于环境空气质量标准的二级年平均浓度限值。2020~2022年PM 2.5和PM 10的比值的月均变化均超过0.5,表示绵阳市大气颗粒物是以PM 2.5为主。大气颗粒物与空气质量指数是呈正态相关,PM 2.5和PM 10为高度相关。2023年1~2月PM 2.5和PM 10超标率分别达到37.29%和11.86%,高于其他年份的1~2月的PM 2.5和PM 10超标率。

Based on the data of air particulate matter and Air quality index(AQI)in Mianyang City from January 2020 to February 2023,in order to analyze the characteristics of air particulate matter pollution in Mianyang city,SPSS was used to analyze the characteristics of air particulate matter index and air quality index(AQI).The results showed that the monthly average characteristics of the air quality index from 2020 to 2022 showed a W-shaped trend.The monthly average of the air quality index in 2022 ranged from 30 to 100,The excellent air quality accounted for 89.59%in 2022,which indicated the air quality was better.The monthly average concentration of atmospheric particulate matter showed a U-shaped change,with the highest concentration in January and December,and the lowest concentration in July and August.The seasonal variation trend of atmospheric particulate matter concentration from high to low was winter>spring>autumn>summer The average annual concentration was lower than the secondary annual average concentration limit of ambient air quality standards.The average monthly change of PM 2.5 and PM 10 ratio from 2020 to 2022 is more than 0.5,indicating that PM 2.5 is the main atmospheric particulate matter in Mianyang City.There is a normal correlation between atmospheric particulate matter and air quality index,while PM 2.5 and PM 10 are highly correlated.In January-February 2023,the PM 2.5 and PM 10 excess rates reached 37.29%and 11.86%,higher than those in January-February of other years.