Children’s lung growth in London improved markedly as traffic-related air pollution fell following the introduction of the Ultra Low Emission Zone, according to a five-year involving more than 3,400 pupils.

tracked children aged six to nine from 84 primary schools in London and Luton. London children began the study with significantly smaller lungs, but by the end their lung function had caught up with the comparison group.

Exposure to nitrogen dioxide fell more than twice as much in London, while the of children with clinically impaired lung function dropped from 14 per cent to 9 per cent. Researchers say the findings provide strong that damage to developing lungs can be reduced when urban air gets cleaner.