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

<div>Relative variation of CO concentration and traffic flow in the left bore of Cejiexian Tunnel.</div>

Advances in Civil Engineering

Figure 11: Study on the Annual Reduction Rate of Vehicle Emission Factors for Carbon Monoxide: A Case Study of Urban Road Tunnels in Shenzhen, China 