Research Article
Study on the Annual Reduction Rate of Vehicle Emission Factors for Carbon Monoxide: A Case Study of Urban Road Tunnels in Shenzhen, China
Table 4
CO concentrations in the four tunnels (unit: ppm).
| | Tunnel name | Left bore | Right bore | Ventilation equipment condition | | Change range | Maximum | Change range | Maximum |
| | Henglongshan Tunnel | 0～17 | 17 | 0～9 | 9 | Closed | | Cejiexian Tunnel | 0～7 | 7 | 0～6 | 6 | Open during peak hours | | Jiuweiling Tunnel | 0～39 | 39 | 0～9 | 9 | Open during peak hours | | Dameisha Tunnel | 0～6 | 6 | 0～8 | 8 | Closed |
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