Researchers from Queen Mary University of London have released findings that connect the city’s Ultra Low Emission Zone (ULEZ) with better lung health for children. The study tracked more than 3,400 students aged six to nine from 84 schools in London and the nearby town of Luton between 2018 and 2022.
Study design and comparison
London introduced the ULEZ in April 2019, imposing a 24‑hour charge of £12.50 on vehicles that do not meet strict emissions standards. The zone initially covered the inner city and was expanded in August 2023 to include outer boroughs and suburbs. Luton, located about 30 miles north of London, served as a control site because it has similar traffic patterns but no ULEZ.
At the start of the study, children in London displayed significantly smaller lung capacity compared with their Luton peers. Over five years of annual school‑based measurements, the London cohort showed steady improvement, eventually reaching lung‑size levels comparable to those in Luton.
Key findings
The proportion of children with clinically impaired lung function fell from 14% to 9% in London, while Luton saw a smaller decline from 9% to 7%. Researchers noted that the improvement aligns with reduced air‑pollution levels recorded after the ULEZ was implemented.
Lead author Helen Wood, a research fellow at Queen Mary University, said, “We already knew that the ULEZ reduced air pollution but now we know that children’s lung health has improved at the same time, which is a really important finding for children and parents living in London.”
Context and expert commentary
Ian Mudday, associate professor at Imperial College London, called the results “major implications for improving the long‑term health of children,” adding that clean‑air zones can serve as effective public‑health interventions.
Independent experts offered cautious perspectives. Stephen Burgess of the University of Cambridge, who was not involved in the research, praised the data but suggested alternative explanations, such as lower pollution during the COVID‑19 pandemic, could also play a role. Kevin McConway of the Open University echoed this view, noting that the study’s geographic scope was limited to just two areas and that broader data would strengthen the conclusions.
Implications for families and policy
Children whose lungs do not fully develop face higher risks of asthma, chronic obstructive pulmonary disease, cardiovascular issues, and premature death. The study’s evidence that lung deficits can be reversed underscores the potential health benefits of reducing traffic‑related emissions.
Mayor Sadiq Khan, who championed the ULEZ, described the policy as his “hardest decision as mayor of London,” acknowledging the political pushback he faced. He emphasized that the health gains for children validate the city’s commitment to cleaner air.
Looking ahead
While the findings are encouraging, researchers and policymakers agree that additional studies in other cities with and without clean‑air zones would help confirm the causal relationship. For now, the London experience offers a data‑driven example of how municipal environmental measures can align with the well‑being of families and the broader community.
Original reporting: KRDO (Colorado Springs metro) — read the source article.
