CHAI Jinpeng1, CHEN Xuegang1,2,3, ZHAO Zhi1,2
（1. School of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China;
2.Key Laboratory of Arid Region Lake Environment and Recourse of Xinjiang, Urumqi 830054, China;
3. Research Center of Urbanization Development of Silk Road Economic Belt, Xinjiang Normal University, Urumqi 830054, China）
Abstract: In order to better understand the characteristics of air pollution in urban street canyon and provide empirical reference for the optimal design of urban street canyons, this study takes Beijing South Road in Urumqi city as an example to analyze the temporal and spatial distribution of air pollutants (CO, PM2.5) in urban street canyon by mobile monitoring technology and to identify the main influencing factors. The results showed that: (1) the air quality of the morning peak was better than that of the evening peak; the concentration of pollutants at the intersection was generally low, while that under the overpass of Suzhou road was higher; (2) the two pollutants were homologous and the concentrations were highly correlated with the monitoring data from the fixed stations. The pollutant concentration was lower when the wind direction with sharp angle to the street canyon, and the pollutant concentration was higher when the wind speed being high, and the correlation between the pollutant concentration and vehicle flow was low; (3) With the height ratio of buildings on the sides of the street canyon falls between [1.5,2), the concentration of pollutants was low; with the density of road network falls between [12,14), the concentration of pollutants was low, and the road density between [12,14) can reduce the pollutant concentration in the street canyon to the greatest extent.
Key word: street canyon; pollutant concentration; spatial and temporal distribution; influencing factors; geometric form
EARTH AND ENVIRONMENT Vol.49, No.4, Tot No.342, 2021, Page 389-399