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 CO concentration in the left bore of Dameisha Tunnel (ZK1+335).</div>

Advances in Civil Engineering

Figure 9: Study on the Annual Reduction Rate of Vehicle Emission Factors for Carbon Monoxide: A Case Study of Urban Road Tunnels in Shenzhen, China 