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 3
Meteorological parameters in the four tunnels.
| Tunnel name | Air velocity (m/s) | Temperature (°C) | Atmospheric pressure (kPa) | Change range | Average | Standard deviation |
| Henglongshan Tunnel | Left bore | 0∼9.2 | 3.85 | 1.15 | 21∼23 | 100.24∼101.06 | Right bore | 0∼10.3 | 4.63 | 0.98 | 25∼30 | 100.79∼101.23 |
| Cejiexian Tunnel | Left bore | 0∼8.4 | 2.94 | 0.96 | 25∼29 | 100.98∼101.46 | Right bore | 0∼10.1 | 3.66 | 1.46 | 25∼28 | 101.31∼101.54 |
| Jiuweiling Tunnel | Left bore | 0∼4.8 | 2.06 | 0.67 | 25∼27 | 100.27∼100.79 | Right bore | 0∼7.2 | 3.37 | 0.90 | 25∼28 | 100.34∼100.88 |
| Dameisha Tunnel | Left bore | 0∼8.1 | 4.31 | 1.03 | 28∼37 | 100.55∼101.08 | Right bore | 0∼11.0 | 2.83 | 1.31 | 29∼32 | 100.22∼100.65 |
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