Study on the Annual Reduction Rate of Vehicle Emission Factors for Carbon Monoxide: A Case Study of Urban Road Tunnels in Shenzhen, China

Table 7

Average CO emission factors of motor vehicles (mixed traffic) in different regions of China.

Tunnel/test method	City	Test year	Traffic speed (km/h)	EF (g/(km·veh))	Test condition	Reference
Xi’an North Road Tunnel	Xi’an	1996	40∼60	33.279	Urban road tunnel	[43]
Tanyugou tunnel	Beijing	1999	10∼70	23.467	Urban road tunnel	[44]
Bench test	Beijing	2000	19.98	26.100	Urban comprehensive condition	[45]
Taipei tunnel	Taipei	2000	60–70	3.64	Urban road tunnel	[46]
Road calculation model	Shanghai	2003	26.9524	31.4395	Urban hypo-artery road	[47]
Shing Mun Tunnel	Hong Kong	2003	60∼70	1.845	Urban road tunnel	[48]
Bench test	Ningbo	2005	20∼30	21.220	Ningbo road condition	[49]
Tunnel measurement	Xi’an	2006	43.3	6.89	Urban road tunnel	[50]
Road calculation model	Beijing	2010	—	3.75	Urban arterial road	[51]
Yingpan road tunnel	Changsha	2013	30	3.22	Urban road tunnel	[30]
Wenchang Gate-Peace Gate Tunnel	Xi’an	2014	40∼60	1.097	Urban road tunnel	[52]
Henglongshan Tunnel	Shenzhen	2014	10∼40	1.075	Urban road tunnel	This study
Jiuweiling Tunnel			10∼40	4.154
Cejiexian Tunnel			10∼40	1.245
Dameisha Tunnel			30∼60	2.028
Wenchang Gate-Peace Gate Tunnel	Xi’an	2015	33.18	1.097	Urban road tunnel	[53]
East Yan’an Road Tunnel	Shanghai	2016	33.5	1.84	Urban road tunnel	[54]