Sadiq Khan's comments at a New York event have been challenged by his political opponents.
Political Editor, BBC London
"The same things that cause climate change, cause air pollution," he explained. "Nitrogen dioxide, nitrogen oxides, particulate matter and carbon emissions. If you deal with one, you deal with the other." Group leader Neil Garratt said: "I am alarmed to hear the mayor claim that expanding Ulez will cut carbon emissions.
Carbon emissions are even predicted to increase slightly in 10 London boroughs because of increased traffic involving cars which previously skirted their boundaries. Hirra Khan Adeogun, director of the climate change charity Possible, said Ulez was a "first step" but more ambitious climate measures were needed.
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