Outdoor seating in urban tunnels plays a significant role in modifying the microclimate, impacting both thermal comfort and airflow dynamics. These seating areas often act as barriers or facilitators to natural ventilation, altering temperature distribution and humidity levels. The presence of seating can disrupt wind patterns, creating pockets of stagnant air or enhancing cooling effects depending on their arrangement. Materials used for seating, such as metal or wood, also absorb and radiate heat differently, further influencing localized climate conditions. Understanding these interactions is crucial for urban planners aiming to optimize comfort and sustainability in tunnel designs. Studies suggest that strategic placement of seating can mitigate heat island effects while improving pedestrian experiences in confined urban spaces.