Study on the Annual Reduction Rate of Vehicle Emission Factors for Carbon Monoxide: A Case Study of Urban Road Tunnels in Shenzhen, China

<div>Diurnal profile of air velocity in the left bore of Henglongshan Tunnel (Apr 4, 2014).</div>

Advances in Civil Engineering

Figure 6: Study on the Annual Reduction Rate of Vehicle Emission Factors for Carbon Monoxide: A Case Study of Urban Road Tunnels in Shenzhen, China 