Low emission bus zones - bus emissions

MQT on 2017-02-20
Session date: 
February 20, 2017
Question By: 
Caroline Russell
City Hall Greens
Asked Of: 
The Mayor


Your low emission bus zones will see "exclusive use of hybrid or diesel buses with top-of-the-range anti-pollutant systems that meet or exceed Euro VI emissions standards." Please provide data on the emissions performance of these Euro VI diesel buses compared with their hybrid counterparts?


Answer for Low emission bus zones - bus emissions

Answer for Low emission bus zones - bus emissions

Answered By: 
The Mayor

The reason I have been introducing Euro VI buses as quickly as possible to London, particularly to my Low Emission Bus Zones, is because they cut oxides of nitrogen (NOx) and particulate matter (PM) by up to 95 per cent compared to Euro V buses. While adding hybrid systems to Euro VI does reduce carbon dioxide (CO2) and fuel consumption, they do not significantly further reduce NOx and PM.

Emissions for some common fleet types are shown below.


Euro VI Bus Types                            NOx (g/km)              PM (g/km)              CO2 (g/km)

ADL 400H (hybrid)                            0.472                         0.011               915.3

ADL 400 (Diesel)                               0.023                        0.027               1239.8

NRM (hybrid)                                    0.458                         0.010               675.1

Volvo B5H (hybrid)                            0.058                         0.004               950.1

Volvo B5TL (diesel)                            0.059                        0.059               1368.0


Euro V Bus Types                               NOx (g/km)              PM (g/km)         CO2 (g/km)

ADL 400H (hybrid)                             10.417                      0.054               852.7

ADL 400 (Diesel)                                11.344                      0.051               1257.3

NRM (hybrid)                                     2.048                       0.012                690.2

Volvo B5LH (hybrid)                            7.270                       0.030               811.0

Volvo B9TL (diesel)                             9.207                       0.046               1415.2