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Evening Standard
Evening Standard
National
Megan Howe

High air pollution warning issued for London as temperatures to surge to 21C in 'hottest day of the year'

A high air pollution alert has been issued for London as the capital braces itself for what is expected to be the hottest day of the year so far.

City Hall issued the warning on Thursday after forecasters from Imperial College London detected rising air pollution levels from mainland Europe.

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