Sadiq Khan's deputy twice asked an academic to counter research questioning the scheme's benefits.
The leader of City Hall Conservatives has accused Mayor of London Sadiq Khan of "colluding to quash research" on the Ultra Low Emission Zone .
The expansion of the zone, which was unsuccessfully challenged in the courts by five councils, will see drivers in outer London pay £12.50 a day from August 29 if their vehicles do not meet emissions standards.
Prof Kelly agreed to issue a statement that read "the actions of the mayor's office... including the introduction of the Ulez, collectively are providing a major benefit". Prof Kelly said Imperial College was against putting out a "direct contradiction" to the piece but said: "As always, I'm happy to fight back."
He added: "We know we have an air quality problem, but Ulez is dominating the debate and we might be better off looking at other things."
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Deputy London mayor accused over Ulez emails pulls out of media appearanceShirley Rodrigues was due to answer journalists’ questions on Monday.
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