Air pollution in parts of London exceeds EU targets by up to 50% and is endangering health, a study suggests.
Traffic fumes are said to be a major cause of pollution
Parts of Camden, the City of London, Westminster, Lambeth and Islington were the worst offenders, in the study by the Chartered Society of Physiotherapy.
It warns nitrogen dioxide levels in 10 wards were up to 50% above recommended limit and 63 wards were 25% over.
The pollution, much from traffic fumes, could have "severe" consequences for asthma sufferers, say the authors.
Professor Grahame Pope, from the CSP, said: "Our study shows air pollution far exceeds EU target levels across London and is dangerously close to breaching the EU's safe limit in other parts of the country.
"It's bad news for people living and working in the capital as exposure to this pollutant can cause wheezing and shortness of breath.
"Traffic fumes are a major source of this pollution, so we are urging the government to look at cleaner fuel options."
The EU says NO2 levels need to be beneath 40 micrograms per cubic metre to be safe.
Mayor Ken Livingstone is pushing for a multi-million pound "low emission zone" - which would see high-polluting vehicles charged to drive into greater London.