Legal air pollution limits for the whole year have been reached within a month in London, figures show.
It has taken the capital longer to reach the air pollution limit this year than last year when legal levels were breached less than a week into the new year.
Countries including the UK face legal action by the EU if urgent measures are not introduced to tackle the problem.
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Following the meeting EU Commissioner Karmenu Vella said ministers had “some positive suggestions” but they were not substantial enough and limits could be exceeded “even well beyond 2020”.
But while campaigners welcomed action by London Mayor Sadiq Khan to tackle pollution, they warned the relative delay in reaching the limit this year could be down to weather conditions dispersing the dirty air.