LONDON: Air pollution is known to contribute to early deaths from respiratory and cardiovascular disease. There is also mounting evidence to show that breathing polluted air increases the risk of dementia.
Children are vulnerable, too: Exposure to air pollution has been associated with babies being born underweight, as well as poorer cognitive development and lung function during childhood.
Cities including London are looking to tackle the social, economic and environmental costs of air pollution by improving urban air quality using low-emission zones. In these zones, the most polluting vehicles are restricted from entering, or drivers are penalised to encourage them to take up lower emission technologies.
London’s low-emission zone was rolled out in four stages from February 2008 to January 2012, affecting mainly heavy and light goods vehicles, such as delivery trucks and vans.
But our new research, involving more than 2,000 children in four of London’s inner-city boroughs, reveals that while these measures are beginning to improve air quality, they do not yet protect children from the harmful effects of air pollution.
GROWTH OF YOUNG LUNGS AFFECTED
Our study focused mainly on the boroughs of Tower Hamlets and Hackney, but also included primary schools in the City of London and Greenwich.
All of these areas experienced high levels of air pollution from traffic, and exceeded the annual EU limit for nitrogen dioxide (NO2). What’s more, they have a very young demographic and are among the UK’s most deprived areas.
Our findings confirmed that long-term exposure to urban air pollution is related to smaller lung volumes among children. The average exposure for all children over the five years of our study was 40.7 micrograms of NO2 per cubic metre of air, which was equivalent to a reduction in lung volume of approximately 5 per cent.
Changes of this magnitude would not be of immediate clinical significance; the children would be unaware of them and they would not affect their daily lives. But our results show that children’s lungs are not developing as well as they could.
This is important, because failure to attain optimal lung growth by adulthood often leads to poor health in later life.
Over the course of the study, we also observed some evidence of a reduction in rhinitis (a constant runny nose). But we found no reduction in asthma symptoms, nor in the proportion of children with underdeveloped lungs.
AIR QUALITY IS STILL NOT UP TO STANDARD
While the introduction of the low-emission zone did relatively little to improve children’s respiratory health, there were positive signs that it was beginning to reduce pollution.
Data found small reductions in concentrations of NO2, although overall levels of the pollutant remained very high in the areas we looked at.
The maximum reduction in NO2 concentrations we detected amounted to seven micrograms per cubic metre over the five years of our study, or roughly 1.4 micrograms per cubic metre each year.
For context, the EU limit for NO2 concentrations is 40 micrograms per cubic metre.
Background levels of NO2 for inner city London, where our study was located, decreased from 50 micrograms to 45 micrograms per cubic metre, over five years. NO2 concentrations by the roadside experienced a greater reduction, from 75 micrograms to 68 micrograms per cubic metre, over the course of our study.
By the end of our study, large areas of central London still weren’t compliant with EU air quality standards – and won’t be for some time at this rate of change.
THE ROUTE FORWARD
Evidence from elsewhere shows that improving air quality can help ensure children’s lungs develop normally.
In California, the long-running Children’s Health Study found that driving down pollution does reduce the proportion of children with clinically small lungs – though it’s pertinent to note that NO2 concentrations in their study in the mid-1990s were already lower than those in London today.
Our findings should encourage local and national governments to take more ambitious actions to improve air quality, and ultimately public health. The ultra-low-emission zone, which will be introduced in central London in 2019, seems a positive move towards this end.
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The scheme, which will be expanded to the boundaries set by the North and South circular roads in October 2021, targets most vehicles in London – not just a small fraction of the fleet.
The low-emission zone seems to be the right treatment – now it’s time to increase the dose.
Ian Mudway is a senior lecturer at the School of Population Health and Environmental Sciences at King's College London. Chris Griffiths is professor of primary care and centre lead in the Centre for Primary Care and Public Health, and deputy director for research at the Blizard Institute.
A version of this commentary first appeared on The Conversation. Read it here.