Taxi Age limit - emissions

MQT on 2013-10-23
Session date: 
October 23, 2013
Question By: 
Jenny Jones
City Hall Greens
Asked Of: 
The Mayor


Did the calculation of emission reductions resulting from the Taxi Age limit take into account the potential increase in NO2 that could result in a switch to newer taxis? Was that calculation based upon an outdated version (2008) of the London Atmospheric Emissions Inventory?


Answer for Taxi Age limit - emissions

Answer for Taxi Age limit - emissions

Answered By: 
The Mayor

The modelling included in my Air Quality Strategy was based on the latest available London Atmospheric Emissions Inventory at the time, the LAEI 2008. Emissions savings resulting from the taxi age limits policy for both PM10 and NOx were calculated. NOx is the most appropriate focus for understanding emissions changes because it accounts for both primary and potential secondary NO2.

Since the publication of my Air Quality Strategy, the GLA and TfL have continued to improve their understanding of emissions from vehicles in real-world conditions. This informed the development of the latest version of the LAEI (LAEI 2010), published this summer, which adopted the latest Government emissions functions (COPERT IV).

LAEI 2010 continues to show considerable emission savings for both PM (14 per cent reduction in taxi emissions) and NOx (6 per cent reduction) as a result of the introduction of taxi age limits.