Environmental pollution and energy conservation in urban tunnels have become important issues that affect the scientific design\nand sustainable development of urban tunnels. The carbon monoxide (CO) concentration in urban road tunnels is regarded as a\ndirect reflection and a useful tracer of the intensity of anthropogenic transportation activities. Previous studies in recent years have\npaid more attention to pollutant emission factors, but less to the calculation parameters of ventilation design for tunnels. This\npaper aims to study a reasonable annual reduction rate of CO base emission factors. Therefore, a detailed field measurement was\ncarried out in the four typical urban road tunnels, Henglongshan Tunnel, Cejiexian Tunnel, Jiuweiling Tunnel, and Dameisha\nTunnel in Shenzhen, China, from March 29 to September 16, 2014. Measurement results showed that the traffic flow of the four\nurban tunnels had been approaching the design value, or even beyond the limit.
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