High pollution warning issued for London by City Hall

A high air pollution alert has been issued for London on Tuesday as temperatures are forecast to rise above 30C.

City Hall said strong sunshine and hot weather are expected to trigger high ozone levels, with airflow from mainland Europe likely to worsen the situation.

The forecast, produced by Imperial College London, prompted the mayor’s office to trigger the alert, which will be displayed on bus stop countdown boards, London Underground signs and sent to schools and borough councils.

Mete Coban, the deputy mayor for environment and energy, said London’s “toxic air” is linked to around 4,000 premature deaths in the capital each year.