Abstract
China's rapid urbanization process has led to increasingly serious environmental health problems, and has brought severe challenges to the sustainable development of cities and the construction of healthy cities. Under the background of China's urbanization rate of more than 50%, the whole process has entered the second half of the gradual slowdown of the growth rate. Urban development has changed from pursuing high-speed growth and large-scale land expansion to pursuing the improvement of urban environmental quality and healthy life of residents. Taking the built environment of Changsha old city as the research object, this paper constructs the evaluation model of "Thermal Comfort-Green Accessibility-Walking Friendly-Health Care-Exhaust Exposure-Communication Space" from the dimensions of environmental impact, residents' behavior and health risk. Based on the exposure perspective and environmental comfort, this paper proposes a multi-element analysis framework, and carries out quantitative analysis of the elements through urban big data and stack analysis. Finally, based on the actual situation of local health risk exposure level, environmental friendliness and public space, this paper puts forward countermeasures and measures based on spatial planning, such as environmental improvement, health promotion, livability and health equity.
