Research Article
Investigation on the Time Factor of CO-Based Emission Factors for Sustainable Development of Urban Tunnels in China
Table 6
The backcalculated reduction rates of CO-based emission factors (60 km/h).
| | Tunnel | The specified value of qco in 2000 (m3/(km·veh)) | Left bore | Right bore | | The backcalculated value of qco in 2014 (m3/(km·veh)) | Annual reduction factor (%) | The backcalculated value of qco in 2014 (m3/(km·veh)) | Annual reduction factor (%) |
| | Henglong Mountain Tunnel | 0.007 | 0.0020 | 8.4 | 0.0013 | 11.3 | | Cejiexian Subway | 0.007 | 0.0011 | 12.6 | 0.0012 | 11.6 | | Jiuweiling Tunnel | 0.007 | 0.0034 | 4.9 | 0.0030 | 6.0 | | Dameisha Tunnel | 0.007 | 0.0023 | 7.6 | 0.0022 | 7.9 |
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