This chapter elucidates the critical differences between disturbed wind speed generated by human movement and ambient natural wind, and their distinct impacts on outdoor thermal comfort evaluation. The background necessitating this distinction is first introduced. It is demonstrated that disturbed wind speed, characterized by higher velocity and altered spectral properties compared to natural wind, plays a dominant role in convective heat loss for moving individuals. The factors influencing the characteristics of disturbed wind are explored. By accounting for this self-generated airflow, the accuracy of thermal comfort prediction for active populations in outdoor settings can be significantly improved. Furthermore, the implications for urban design and ventilation strategies are discussed. Finally, a summary of key findings and future research directions is presented.