Londoners have been asked not to leave their engines idling or burn garden waste as a high air pollution alert comes into effect in the capital.
City Hall gave the warning on Tuesday as temperatures in part of the city could reach 34C.
Londoners have been asked not to leave their engines idling or burn garden waste as a high air pollution alert comes into effect in the capital.
City Hall gave the warning on Tuesday as temperatures in part of the city could reach 34C.