Research Article
Investigation on the Time Factor of CO-Based Emission Factors for Sustainable Development of Urban Tunnels in China
Table 2
The CO emission factors of passenger cars (g/(km·veh)).
| | Year | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 |
| | Source | Chongqing road condition | Xiamen road condition | Tianjin road test | Foshan road condition | Beijing road condition | Guangzhou road condition | Hangzhou road condition | Hohhot road condition | East Yan’an road tunnel test | Changsha Yingpan road tunnel test | Xi’an road condition |
| | EFCO | 31.93 | 19.6 | 13.67 | 9.82 | 5.528 | 3.26 | 1.80 | 1.75 | 2.51 | 1.72 | 1.04 |
| | Reference | [49] | [50] | [51] | [52] | [53] | [54] | [55] | [56] | [57] | [58] | [59] |
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