Ultra low emission zone in London reportedly accelerates children's lung growth to match less polluted area

The study tracked over 3,400 primary school children in London and Luton, comparing lung function before and after the introduction of London’s Ultra Low Emission Zone (Ulez). Children in London, whose lung growth had been stunted by pollution, showed significant improvements in lung capacity after Ulez was implemented. The results suggest that reducing vehicle emissions can reverse some of the harm caused by air pollution, particularly in vulnerable populations like children.

Lung function tests measured how much air children could forcibly exhale in one second, a standard metric for respiratory health. The London group’s lung capacity improved to match levels seen in Luton, a less polluted area with similar pollutant types. While the London children’s lung growth accelerated, the proportion of those with clinically impaired lung function also dropped from 14% to 9%. This indicates that emission controls may have tangible health benefits beyond just slowing damage.

The study’s design accounted for socio-economic background, physical activity, and ethnicity, strengthening the link between Ulez and the observed health improvements. However, independent researchers caution that other factors, such as broader pollution trends or pandemic-related changes, may have played a role. The study period included the COVID-19 pandemic, but the comparison with Luton suggests the findings are not solely due to pandemic effects.

London’s Ulez targeted older, more polluting vehicles with daily charges, reducing nitrogen dioxide levels faster than in Luton. The study’s authors argue this demonstrates that ambitious clean air policies can drive rapid health improvements. For engineers, this underscores the importance of integrating health outcomes into urban planning and emission control technologies, particularly in high-pollution areas.