步行、自行车等体力型出行有利于促进绿色交通与公共健康，而空气污染却给出行者带来健康风险。课题组初步发现体力型出行行为受到呼吸暴露的影响，但其内在机制未被探明。本研究选取上海若干典型地区，采用移动设备测定步行和骑行微环境的代表污染物浓度，构建CFD污染扩散模型动态模拟街道环境浓度时空间分布；结合出行轨迹数据量化评估个体暴露剂量，比较地区暴露模式差异及其街区设计特征要素的影响。采用面板分析方法，考察不同呼吸暴露水平下体力型出行活动频次、时辰、时长、方式等变化；通过RP和SP结合的抽样调查方法，获取个体基于感知与告知暴露情形的出行活动数据，构建暴露与距离相权衡的PSL路径选择模型，揭示个体对不同暴露水平的路径选择偏好。最后从规划应对角度，提出“设计干预-交通组织-暴露评估”相整合的技术方法和体力型出行呼吸健康导向的街区规划模式，对完善“宜步行、宜骑行”的绿色交通和健康城市规划理论有重要意义。

Active travel moedes including walking and cycling are of significance in promoting green transport and public health; however, air pollution causes health risks to the travellers. Our research team discovered that active travel is influenced by respiratory exposure evidently, its underlying behavioral mechanism has not been ascertained yet. We select several typical areas in Shanghai for case study and utilize portable devices to measure the concentration of some key pollutants in active travel micro-environment, then to simulate temporal and spatial distribution of polltant concentration through building up a CFD pollution diffusion model. With overlay analysis of real-time trajectory data of active travels, we quantitatively estimate the individual's exposure dose, and then compare the differences on exposure characteristics of each study area due to district design attributes. Further, we track the changes of active travel activities under different exposure concentration circumstances by panel analysis method to understand the effects of respiratory exposure on travel frequency, time, duration and mode shift, etc. We also adopt RP and SP sampling survey method to acquire individual’s travel activity data under the perceived and informed exposure scenarios. In that, we build a PSL route choice model to reveal individuals’ preferences for different exposure levels of route, considering the trade-off of exposure dose and travel distance factors. Finally, from the perspective of planning application, a healthy-oriented planning model for activel travel as well as a technical method integrating design intervention and traffic organization with respiratory exposure estimation is proposed. The study will have essential implications on improving “walkable and bikable” green transport as well as healthy city planning theories and practices.