Strategies for sustainable urban development and morphological optimization of street canyons: Measurement and simulation of PM2.5 at different points and heights

In the context of urban construction and reconstruction, the sustainable development of cities, air quality and the health of urban residents need to be considered, especially urban street canyons that are closely related to residents. However, traditional street canyons are optimized from a single urban microclimate level, and lack multi-dimensional optimization strategies to deal with climate change and pay attention to human respiratory health. In this study, the Changhuai Street Canyon in Hefei, Anhui Province, China was taken as the measure-ment object, and ENVI-met was used to simulate the fine particles and the physical environment. First, control the three-dimensional space of street canyons reasonably, and then optimize the spatial form of urban street canyons. Second, the PM2.5 concentrations at different selected points and heights were obtained. Finally, the optimization strategy of reducing building height, widening road width and increasing street canyon greening is proposed. This study is based on the comparison of pollutant concentrations between winter and summer in Changhuai street canyons, different sample locations, and different building heights to improve the spatial form of urban street canyons, implement the "dual carbon" goal, and promote sustainable urban development.