Spatiotemporal Distribution of Atmospheric Particles and Influencing Factors in Urban Park Based on the View of Public Health

The pollution of inhalable particles is increasingly harmful to public health. Urban parks are the main outdoor public spaces, and the spatiotemporal distribution of particle pollution is closely related to the health of people. In sunny and breezy days of autumn, the study explored the spatiotemporal distribution characteristics of particulate concentrations in different spaces of urban parks and their relationship with environmental factors in the five kinds of landscape spaces（square, lawn, semi-indoor space, forest space, waterfront space） of urban parks, by monitoring the concentration of particles(PM1, PM2.5, PM10) and environmental factors（wind speed, temperature, humidity, sky view factor, leaf area index） in different spaces of urban parks. The results showed that there was significant difference in PM1 and PM2.5 concentrations between lawn and other spaces（P＜0.05）; the change trend of the concentration of particulate matter in different spaces was the same in one day, and there was significant difference between some periods（P＜0.05）, the peak and valley were both between 14:00-16:00, so people should do outdoor activities in the period（14:00-16:00） of low particle concentration; in the same space, the concentrations of three kinds of particulate matter were negatively correlated with the air temperature, positively correlated with the relative humidity; land cover types, ways of people’s activities, and the structure of surrounding phytocoenosium all affected the concentration of particle. The research results provide basis and suggestions for park planning and design and people to use parks based on the view of public health.