Effect of Weather and Green Space on PM2.5 Concentrations in Urban Park in Autumn and Winter

Determinations were implemented during September 2019 and January 2020 on PM2.5 concentration, air temperature, relative humidity andwind speed in different plant distribution sample plots under different weather conditions in Shishan Park of Lin’an, Zhejiang province. The resultsshowed that the PM2.5 concentrations in winter were higher than that in autumn. The daily average PM2.5 concentration in continuous cloudy days wasremarkably higher than that of the left. Under different weather conditions, there was extremely significant negative correlation between PM2.5concentration with temperature and wind speed (except in continuous cloudy days), but significant positive one with relative humidity. The relativehumidity was the main factor to influence PM2.5 concentration. The experiment demonstrated that concentration of PM2.5 in different green spaces wasordered by lawn > trees and grasses > trees, shrubs and lawn.