Vehicle type

Source

CO₂ (g/km)

CO (g/km)

NO_x (g/km)

PM₁₀ (g/km)

Gasoline buses

Hu et al. (2006)

1400

93.92

8.51

0.816

Diesel buses

Hu et al. (2006)

1171.32

7.2

21.33

0.126

Euro I (2002)

1125.9

3.3

11.6

0.6

Euro II (2005)

1082.5

3.0

12.4

0.3

Euro IV (2010)

1072.8

0.3

6.4

0.1

Euro V (2016)

1072.8

0.3

3.6

0.1

Euro VI (2050)

1072.8

0.3

0.7

0.1

CNG

Hu et al. (2006)

1072.4

79.96

8.79

0.071

Euro I (2002)

1530.6

8.4

16.5

0.1

Euro II (2005)

1420.3

2.7

15.0

0.1

Euro IV (2010)

1254.8

1.0

10.0

0.1

Euro VI (2016)

1254.8

1.0

10.0

0.1

Euro VI (2050)

1072.8

0.3

0.7

0.1

LPG

Hu et al. (2006)

1254.4

87.13

6.93

0.083

Bioethanol-gasoline buses

Clairotte et al. (2013)

1362.2

0.28

0.014

0.0005

Hybrid buses

Chen & He (2013)

77

95

0

21.6

Battery electric buses

-

-

-

-

-