The purpose of tunnel ventilation control is to provide a safe and comfortable environment for users. The tunnel ventilation is optimized by controlling jet fans and dust collectors installed inside the tunnel. The jet fans blow polluted air from inside the tunnel toward air exit ports. The dust collectors remove soot and smoke so that pollutant concentration inside the tunnel can be better measured by CO (carbon monoxide) meters. Since this is a process involving many elements which are difficult to quantify exactly, the predictive fuzzy control is introduced to solve the problem. By means of this approach it was made possible to reduce electric power consumption greatly while keeping the degree of pollution within the allowable limit. (C) 2003 Elsevier Ltd. All rights reserved.