Analysis of Temporal Variation and Relevance of Air Pollution in Shijiazhuang City from 2020 to 2022
Based on the data of air pollutant concentration in Shijiazhuang City,this paper analyzed the change characteristics of air pollution and the temporal distribution of primary pollutants in Shijiazhuang City from 2020 to 2022 with the air quality index method,and used the association rules method to study the internal correlation between air pollutant concentrations.The results indicated that with the continuous development of air pollution prevention and control,the air quality in Shijiazhuang had gradually improved,the type of air quality index was mainly good and mild pollution.The AQI level showed a shift from higher pollution to better and lower pollution levels,and the number of severe pollution days in 2022 has appeared"zero report"for the first time.The number of days with primary pollutants decreased year by year,and the seasonal distribution characteristics showed that PM2.5 pollution was mainly in winter,and O3 pollution was mainly in summer.In the association rule model,the rule{PM2.5=2}=>{PM10=2}indicated that the PM2.5 average daily mass concentration of 35-75 μg/m3 accompanied by PM10 average daily mass concentration of 50-150 μg/m3 might occur in all seasons,and the confidence in winter was 100%,which provided a theoretical basis for future delicacy management and control.