Dynamic Changes and Influencing Factors of Negative Air Ions and PM2.5 in Forest Recreation Areas of Xinyu City
To reveal the spatiotemporal distribution patterns,interactive effects,and influencing factors of negative air ions and PM2.5 in the forest recreation area of Xinyu City,Jiangxi Province,the spatiotemporal distribution char-acteristics of air negative ions and PM2.5 concentrations in its forest environment and their relationship with meteoro-logical factors were measured and analyzed.The results showed that the annual trend of negative air ions in the Xinyu city forest recreation area and urban green spaces was generally consistent.The negative air ions concentration in the forest was significantly higher than that in the urban green spaces in each month of the year,and the PM2.5 concentration in the urban green spaces was significantly higher than that in January,March,and April,with no sig-nificant difference between other months.The concentrations of negative air ions and PM2.5 in the air from June to August in summer reached their highest and lowest values throughout the year,respectively.The concentration of negative ions in forest air gradually increased with altitude,while the content of PM2.5 first increased and then de-creased,as the vertical height from the ground increased,the concentration of air negative ions in the forest first de-creased,then increased and remain unchanged.The PM2.5 content gradually decreased,and the middle layer of the forest canopy at a height of 10 meters from the ground had higher negative air ions and lower PM2.5 content.There was a significant negative corr-elation between forest negative air ions and PM2.5 concentration,and the correlation with meteorological factors was not consistent,but the correlation with air pressure,temperature,relative humidity,wind speed,and direction was not consistent in different seasons.The forest recreation area in Xinyu city has the best air quality in summer,with an 1 000 m altitude of mountainous areas,and in the middle of the forest canopy,making it an ideal place for building forest air health and recuperation activities.
negative air ionsPM2.5air qualityXinyu cityforest recreation area
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