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Scientists have expressed surprise at the rapid recovery and growth observed in young children’s lungs following the implementation of pollution control measures in their communities. A particular focus of this research was the impact of London’s Ultra Low Emission Zone (Ulez), introduced in 2019, which successfully reduced harmful emissions in the city. The study observed notable lung capacity improvements in children whose lung development had previously been hampered by air pollution.
The research tracked over 3,400 primary school children from London and Luton over a five-year period. By comparing those living within London’s Ulez to peers in Luton—an area with lower pollution but similar pollutant types—the scientists aimed to evaluate the effectiveness of local clean air initiatives. The findings provide some of the most compelling evidence to date that such pollution management zones can mitigate damage caused to lungs during childhood. However, some independent experts advise that additional factors should be considered in interpreting the results.
Air pollution is known to negatively affect the developing lungs of children, making them more susceptible to conditions like asthma, heart disease, diabetes, and even early mortality. Since children’s lungs and immune systems are still growing—and given that they often spend time closer to ground-level sources of pollution such as vehicle exhausts—their vulnerability is increased. The tragic case of Ella Adoo-Kissi-Debrah, a nine-year-old girl from London whose death in 2013 was later attributed to air pollution, highlights the severe consequences of polluted environments on young respiratory health.
Within the study, children aged six to nine attending schools inside London’s Ultra Low Emission Zone underwent annual lung function tests beginning one year prior to the zone’s introduction and continuing for four years afterwards. Early in the study, lung capacity was consistently smaller among London children compared to their Luton counterparts, despite similar pollutant compositions in both areas. By the conclusion, lung capacity levels in the London group had nearly equalized with those in Luton, indicating accelerated lung growth. Prof Chris Griffiths from Queen Mary University of London, a senior author on the study, remarked, “I was absolutely stunned when I first saw the results. The speed of catch up in lung capacity in the London group was surprising and impressive. This shows an ambitious clean air zone can drive pollution levels down, rapidly restoring children’s stunted lung growth.”
The main assessment used measured the volume of air a child could forcefully exhale in one second after taking a deep breath. Such improvements suggest that children in London might perform physical activities, like running or blowing out candles, with less breathlessness compared to before Ulez was introduced. Another lung function test also revealed gains, though they were less pronounced, indicating further opportunities for improvement remain. Notably, the proportion of London children with clinically impaired lung capacity—conditions linked to symptoms such as coughing and breathlessness—decreased from 14% to 9%. Comparatively, Luton saw a smaller decline, from 9% to 7%. Additionally, nitrogen dioxide exposure among London children dropped more rapidly than in Luton, which researchers believe is a crucial indicator that better air quality due to Ulez was instrumental in accelerating lung growth.
London’s Ultra Low Emission Zone was initially launched by the city’s mayor in 2019 to counteract high levels of nitrogen dioxide pollution caused primarily by motor vehicles. Under this scheme, older and more polluting vehicles were required to pay a daily charge to access central London, with the zone eventually expanding to cover a broader area. While the policy received considerable support, it also encountered political opposition and protests.
Commenting on the study, independent expert Prof Anna Hansell of the University of Leicester noted that the improved lung function observed “is likely to have lifelong benefits for their health.” She praised the rigor of the research and highlighted the importance of comparing London with Luton to account for general pollution reductions occurring over the study period, including those related to the Covid-19 pandemic. Similarly, Kevin McConway, emeritus professor at the Open University, recommended considering the full effects of the pandemic and suggested that examining data from other cities could help clarify whether London’s improvements were influenced by unmeasured factors. Dr Helen Wood, lead author from Queen Mary University, emphasized that despite the encouraging results, continued efforts are essential as air pollution levels in London, Luton, and other UK cities remain above World Health Organization guidelines. Prof Griffiths added, “We know clean air zones are a complex area and the impact on businesses and individuals must be considered. What we are doing is adding new evidence to inform the debate.” He also stressed the global importance of the findings, noting that more than a billion children worldwide live in polluted urban environments, adversely affecting their health from an early age.
This collaborative research involved scientists from the Universities of Bedfordshire, Oxford, Cambridge, Edinburgh, and the University of Southern California and has been published in The Lancet Public Health
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