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 5
Maximum CO concentrations and the corresponding measured data.
| | Tunnel name | Maximum CO concentration (ppm) | Occurrence time | Hourly average air velocity (m/s) | Hourly traffic volume (pcu/h) | Average traffic speed (km/h) |
| | Henglongshan Tunnel | Left bore | 17 | 8:33 | 2.8 | 3660 | 10 | | Right bore | 9 | 11:26 | 2.9 | 4458 | 10 |
| | Cejiexian Tunnel | Left bore | 7 | 19:08 | 1.5 | 1004 | 20 | | Right bore | 6 | 16:11 | 2.6 | 1601 | 10 |
| | Jiuweiling Tunnel | Left bore | 39 | 18:25 | 0.3 | 1774 | 10 | | Right bore | 9 | 22:21 | 3.9 | 1801 | 30 |
| | Dameisha Tunnel | Left bore | 6 | 17:45 | 4.9 | 2408 | 30 | | Right bore | 8 | 11:59 | 3.8 | 2253 | 30 |
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