Taxi Emissions - nitrogen dioxide (NO2)

MQT on 2013-09-11
Session date: 
September 11, 2013
Question By: 
Stephen Knight
Liberal Democrats
Asked Of: 
The Mayor


Recent research commissioned on behalf of the Department of Food and Rural Affairs (Defra) has found that the proportion of nitrogen dioxide (NO2) within total NOx emissions from taxis has been steadily increasing since around 2008. Given the intensity of taxi operations in central London, what action(s) will you take to reduce the levels of NO2 being emitted by newer taxis? Will you amend your 15-year age limit if it is found to be inadvertently increasing levels of NO2 across London?


Answer for Taxi Emissions - nitrogen dioxide (NO2)

Answer for Taxi Emissions - nitrogen dioxide (NO2)

Answered By: 
The Mayor

Officers are drafting a response which will be sent shortly.


Written response from the Mayor received 28 October 2013

As was outlined in my Air Quality Strategy, the introduction of age based limits for taxis was specifically targeted to reduce the most harmful particulate matter emissions by retiring the oldest, most polluting taxis. While there have been well documented issues with NOx/NO2 emissions from Euro 4 and 5, Euro standards have been extremely effective at reducing particulate emissions.


I recognise, however, that further work is required to reduce emissions from taxis, including for NOx/NO2 emissions. The most effective way to do this is to have a taxi capable of zero emission operation and I am working with manufacturers to develop a suitable taxi as soon as possible.