New Bus for London pollution

MQT on 2014-11-19
Session date: 
November 19, 2014
Question By: 
Darren Johnson
City Hall Greens
Asked Of: 
The Mayor


How many of the 800 'New Routemasters' you have ordered will meet the Euro 6 air quality standard, and how many that fail to meet this standard will be allowed into the Ultra-Low Emission Zone?


Answer for New Bus for London pollution

Answer for New Bus for London pollution

Answered By: 
The Mayor

I expect 494 of the 800 New Routemasters to be fitted with the latest Euro 6 engine and 306 with the Euro 5.

The Euro 5 buses are the cleanest diesel-electric hybrids of their generation in the fleet with nitrogen oxide (NOx) emissions close to the Euro 6 standard (a reduction of 80 per cent on a fleet average Euro 5 compared to 95 per cent for a Euro 6).

TfL will operate these buses in the ULEZ because of the marked air quality contribution they will make. No other types of diesel-electric Euro 5 hybrids buses come close to the New Routemaster for NOx and will not be allowed to operate in the ULEZ without modification.

TfL must spend its funds as cost efficiently as possible to raise air quality in London at the earliest time. Replacing higher emitting Euro III buses outside the ULEZ, for instance, would cut NOx from these vehicles by up to 95 per cent.

However, upgrading 306 New Routemasters from Euro V to the Euro VI standard would result in a vehicle NOx saving of 15 per cent. The cost would be £7 million to £15 million, depending on technical challenges faced, and would increase NOx savings for the ULEZ from only 51% to 52% in 2020 - a poor emission return by comparison. The latter strategy frees up resources to remove higher emission vehicles from London sooner and bring about more rapid change in air quality.

TfL is confident Euro VI engines delivers markedly better exhaust emissions after testing most types available on a standard London buses test cycle. This shows that in real-world conditions they deliver a step-change in performance.

[Note: The following are priority questions, but not in proportional order.]