Field measurement of thermal environment and air pollution level inside an urban road tunnel during the evening rush hour

Some urban road tunnels serve as the main traffic access routes for residents in surrounding large communities. The congestion is a common phenomenon during rush hours inside this kind of tunnel. In order to learn about environmental parameters tunnel evening hour, comprehensive measurement typical commuting conducted. thermal environment and air pollutant distribution along are measured simultaneously. results show that volume, vehicle speed velocity take on obvious temporal spatial discrepancy. There average 4.58°C temperature rise 96μg/m3 PM2.5 concentration from entrance exit. at exit 2.67 times 24-hour limit Chinese standard. gradients PM 2.5 hour given out.