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 Henglongshan Tunnel (ZK1+081).</div>

Advances in Civil Engineering

Figure 8: Study on the Annual Reduction Rate of Vehicle Emission Factors for Carbon Monoxide: A Case Study of Urban Road Tunnels in Shenzhen, China 