**2. Descriptions**

This Special Issue consists of research in two directions, including smoke movement under natural ventilation and smoke control, and establishes a firm foundation for future research in the field of fire-induced smoke movement and control. Efforts regarding smoke transportation law under natural ventilation have been emphasized due to the importance of determining fire hazards. The dimension effect (curvature [5] and tunnel width [9] of underground space; deck spacing of the double-deck bridge [10]) and fire source effect (heat release [5,11] and fire source location [9]) on two-dimensional temperature distribution and smoke layer entrainment have been quantified. These scientific articles contribute fire hazard assessment methods to various building fires.

Recently, the contribution to smoke control is increasing continuously. Smoke control can be divided into passive and active control technologies. In terms of passive smoke control, a methodology for field testing of smoke control properties of fire facilities [12] and an optimized natural ventilator [13] have been provided. Compared to the passive method, active control receives more attention. Aiming at the underground space, ship engine room, and large atrium, the important design parameters of smoke control system, such as smoke vent layout [4], smoke exhaust rate [4,9,13], air supply volume [14], and longitudinal ventilation velocity [15–17], have been well-addressed. Advances in smoke exhaust strategies have the potential to guide engineering practice.
