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Mayor Sadiq Khan today put London on toxic air alert for at least three days. City Hall has warned that air pollution could rise to ‘moderate levels’ today in the City and 17 boroughs and then hit ‘high’ in Westminster and Square Mile tomorrow before reducing to ‘moderate’ on Friday. The Mayor of London, who’s pledged to spend a whopping £875 million on London's pollution problem, said: ‘London’s dirty air is a public health emergency. “We will continue to use all the technology at our disposal to inform Londoners about levels of air pollution in their neighbourhoods.”

Official advice issued by the Department for the Environment says: "Adults and children with lung problems, and adults with heart problems, who experience symptoms, should consider reducing strenuous physical activity, particularly outdoors." They’ve told older people and anyone with lung problems, asthma or heart problems to reduce strenuous physical activity outdoors on 'moderate' and 'high' air pollution days, while anyone experiencing sore eyes, a cough or sore throat should also advised to reduce their physical activity when levels are 'high'.
London Mayor Sadiq Khan declares a public health emergency for at least the next three days because of high levels of air pollution in the London area. The Department for Environment says this pollution episode could last until at least Sunday.