Portable Emission Testing on all Euro 6 buses

Meeting: 
MQT on 2014-11-19
Session date: 
November 19, 2014
Reference: 
2014/4231
Question By: 
Jenny Jones
Organisation: 
City Hall Greens
Asked Of: 
The Mayor
Category: 

Question

Will you ask Transport for London to use Portable Emission Testing in real life, urban conditions as the basis of any Euro 6 vehicles being allowed to enter the proposed Ultra Low Emission Zone, or for any new buses to be allowed operate on London bus routes?

Answer

Answer for Portable Emission Testing on all Euro 6 buses

Answer for Portable Emission Testing on all Euro 6 buses

Answered By: 
The Mayor

No. It is not practical to put Portable Emission Measurement System equipment on the back of buses in service as it is bulky, protrudes from the exhaust and might be hit from behind. The TfL emission test for buses already replicates real-world conditions and is conducted at an independent proving ground so vehicles can be compared in an identical way. In the case of selective catalytic reduction equipment tested at Millbrook Proving Ground, TfL also verified the emission results with NOx sensors fitted to a vehicle in actual service. This avoided the potential risks mentioned above.