The City of London has implemented new, stricter emissions standards that apply to the entire taxi fleet. Taxis are currently estimated to be responsible for 18% of the NOx and 34% of the PM10 road transport emissions in central London.
All vehicles at Pre-Euro and Euro-1 emissions levels (i.e., the oldest vehicles), will now have to present themselves for their annual licensing inspection with approved emission reduction equipment. By July 2008 all taxis will have to be at least at Euro-3 levels.
Cleaning up the environment and promoting a green agenda is a top priority for London. London has the worst air quality in the UK and last year air pollution was estimated to have caused 1,000 premature deaths in the capital.
...We are also working to making London a Low Emission Zone by 2008, which will see the removal of the most polluting lorries, buses and coaches from the streets.—Mayor of London Ken Livingstone
In April 2005, an environmental charge of 20p (US$0.37) was added to the fixed minimum fare and was introduced to meet the cost of converting taxis to reach new environmental standard.
The new emissions requirements for taxis went into effect 1 July.