Low-emission buses in London

There are 3,776 hybrid buses, 1,951 battery electric buses, and 20 hydrogen fuel cell buses operating in London, as of March 2025, out of a total bus fleet of 8,797 – this is around 65% of the bus fleet.

In 2021, it was announced that all buses in the fleet meet or exceed Euro VI emission standards, following the phasing out of older buses, the retrofitting of diesel vehicles and the introduction of new hybrid and electric buses. From 2021, all new buses will be zero emission, and the entire bus fleet will be zero emission by 2034, although Transport for London (TfL) have stated that with additional funding, this could be achieved by 2030.

In June 2025, TfL announced that over 2,000 zero emission buses were in service, with 107 zero emission bus routes. This is second largest in Europe behind that of Moscow, which has over 2,700 electric buses operating. TfL note that the bus fleet has lower carbon dioxide emissions per passenger kilometre than other major cities such as New York, Paris and Vancouver.

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