NOx emissions compliance

MQT on 2016-10-19
Session date: 
October 19, 2016
Question By: 
Caroline Russell
City Hall Greens
Asked Of: 
The Mayor


What retrofit measures are being considered to get buses and other commercial vehicles as clean as possible as soon as possible? Do these measures include both pre- and post- combustion options?


Answer for NOx emissions compliance

Answer for NOx emissions compliance

Answered By: 
The Mayor

The latest buses have been manufactured to get the lowest emissions from the engine and include exhaust 'after-treatment' to reduce emissions even further. I am proposing that advanced selective-catalytic systems (SCR) are used to bring around 5,000 existing buses up to the Euro VI emission standard or better, which is a stretching engine emissions target for the fleet.

The previous retrofit programme of around 2,300 Euro III buses in the fleet combined with the retirement of non-retrofitted Euro III buses by the start of 2016 has been successful at bringing down oxide of nitrogen (NOx) emissions by 20 per cent compared to 2012 levels. The SCR systems used brought them close to the Euro VI emission standard for NOx.

Through LoCITY, TfL is working with the freight industry and manufacturers to move closer to zero-emission or zero-emission capable commercial vehicles.

In the medium term, I have proposed that all new double deck buses are hybrid or zero-emission from 2018 and am also consulting on proposals to both extend the Ultra Low Emission Zone and bring forward its introduction.