Cleaner Air, Healthier Children: Reasons for Hope

Illustration of children walking to school past an electric car charging beside homes with solar panels. — Cleaner transport and electricity offer opportunities to improve the air children breathe. Illustration.

For anyone living with asthma, the prospect of fewer children developing the condition has real meaning. Less breathlessness, fewer disturbed nights, and less worry for children and their families are benefits we can readily understand.

Changing how we travel and generate electricity involves considerable investment, disruption and political debate. Much of the discussion centres on protecting the climate in decades to come. But cleaner transport and energy also offer opportunities to improve health today.

Research is showing movement in an encouraging direction. Electric vehicle uptake has been associated with lower measured exhaust-related pollution. Separately, studies have recorded better lung development and fewer new childhood asthma diagnoses as air quality improves.

These findings do not answer every question, but together they provide a stronger basis for hope than any single headline.

Are electric vehicles associated with cleaner air?

Battery electric vehicles produce no exhaust emissions where they are driven. Whether their growing numbers make a detectable difference to the surrounding air is a question researchers can investigate.

A study published in The Lancet Planetary Health in 2026 examined electric vehicle registrations and satellite measurements of nitrogen dioxide across 1,692 Californian areas between 2019 and 2023.

Within an area, an increase of 200 electric or plug-in vehicles was associated with approximately 1.1% lower satellite-measured nitrogen dioxide. The relationship remained after adjustments for factors including population, education, working from home and fuel prices. It also remained when researchers excluded 2020 to check whether pandemic restrictions explained the finding.

The researchers checked ground-level pollution monitors too. These showed an association in the same direction, although the statistical uncertainty narrowly included no change. An earlier Californian study had also found a downward association between EV uptake and nitrogen dioxide, but that pollution result was not statistically conclusive.

The newer satellite findings therefore add useful evidence that the transition towards electric vehicles is being accompanied by measurable improvements in exhaust-related air pollution. They remain observational findings, rather than proof that EVs alone caused the reductions.

Does cleaner air translate into healthier children?

There is encouraging evidence here too—including from Britain.

The Children’s Health in London and Luton study, known as CHILL, recruited 3,414 children aged six to nine before London’s Ultra Low Emission Zone, or ULEZ, began operating in 2019.

Researchers measured their lung function annually, comparing London children with children in Luton, which had no equivalent clean-air zone.

Initially, London children had lower average lung function. Over the following four years, their estimated nitrogen dioxide exposure fell faster than in Luton, and their lung function grew faster.

By the end, the initial difference in the main breathing measure, FEV₁, had disappeared. This measures how much air someone can forcefully breathe out in one second. Not every breathing measure showed complete catch-up, but the improvement was encouraging.

CHILL evaluated a real policy intervention as a natural experiment. Children were not randomly allocated to different environments, so other explanations cannot be completely excluded. Nevertheless, researchers measured changes in children’s breathing rather than simply predicting benefits.

The study did not establish how many asthma cases ULEZ prevented, or attribute the improvement specifically to electric vehicles.

Have researchers observed fewer new asthma cases?

Yes. A Californian study published in JAMA followed 4,140 children initially free of asthma, across three groups studied between 1993 and 2014. Researchers recorded new asthma diagnoses through follow-up questionnaires.

For the pollution reductions examined, declining nitrogen dioxide was associated with approximately 20% lower asthma incidence, while declining fine-particle pollution was associated with approximately 19% lower incidence. These were separate analyses of overlapping changes, so the percentages cannot be added together.

Another study from the same wider Californian research programme measured lung function annually in 2,120 children. Across successive groups growing up in cleaner air, the proportion with clinically low FEV₁ at age 15 fell from 7.9% to 3.6%.

These are complementary findings, although they are not wholly independent confirmations because they come from the same research programme.

They support the possibility that cleaner air can help children develop healthier lungs and reduce the likelihood of developing asthma.

What did the original EV–asthma paper do?

A paper published in Environmental Research in 2025 brought vehicle electrification and childhood asthma together in one analysis.

Researchers at the University of Toronto combined US childhood asthma surveys, pollution estimates and vehicle sales data from 2013–2019. They estimated the portion of childhood asthma attributable to traffic pollution, then examined its relationship with electric and conventional vehicle sales.

Higher EV sales were associated with a lower estimated burden of traffic-pollution-related childhood asthma. The headline estimate was approximately one fewer new case for every 264 new electric vehicles sold, with a reported 95% confidence interval of 113–401 vehicles per case.

That figure needs care. The pollution-related asthma cases were estimated, not individually identified as caused or prevented by vehicle emissions. The study found an association; it did not establish a dependable conversion rate between cars sold and children protected.

Its statistical analysis allowed for some geographical differences and time trends. However, EV uptake can accompany higher incomes, better housing, other clean-air measures and replacement of older vehicles. These could explain part of the association.

State-level asthma and sales figures also cannot reveal whether cleaner vehicles replaced polluting journeys in the neighbourhoods where children were most exposed. The reported confidence interval does not capture every possible bias.

How does Britain compare?

Britain is further ahead than the US in adopting electric cars. In 2024, battery electric cars and plug-in hybrids together accounted for nearly 30% of new UK car sales, compared with just over 10% in the US. These figures concern new sales, rather than all cars on the road, and plug-in hybrids retain a combustion engine.

We have also substantially reduced conventional vehicle exhaust pollution. Between 1990 and 2024:

Nitrogen oxide emissions from UK cars and taxis fell by 88%.
Fine-particle exhaust emissions from road transport fell by 93%.

Much of this progress resulted from tighter emissions standards and began before widespread EV adoption. It shows that sustained action can substantially reduce harmful emissions.

An illustration—not a UK prediction

Britain registered approximately 473,000 new zero-emission cars in 2025. Applying the US paper’s headline association to that number produces approximately 1,800 fewer new childhood asthma diagnoses in a year. Carrying through its reported statistical interval gives roughly 1,200–4,200.

These are not measured UK benefits, a validated forecast or a confidence interval for Britain. They are arithmetic illustrations of what the scale might look like if the US relationship applied here.

The calculation assumes comparability despite differences in pollution, population and vehicle use. Vehicle categories also differ: the US study included plug-in hybrids, while this calculation uses UK zero-emission cars. Other factors could explain part of the association.

Fewer diagnoses during a year could mean cases delayed as well as prevented altogether. We cannot confidently add successive years to calculate a cumulative number of children protected.

The figure illustrates a possible human scale. The measured pollution and health findings provide the firmer foundation for the argument.

Cleaner electricity matters too

Britain is also changing how electricity is generated.

In 2024, renewables and nuclear supplied approximately 65% of electricity generated in the UK, compared with about 41% in the US. Britain’s final coal-fired power station closed that September, while coal still supplied approximately 15% of US electricity. These comparisons exclude imported electricity.

Replacing fossil-fuel combustion with sources such as wind and solar offers opportunities to reduce air pollution alongside carbon emissions. Cleaner vehicles and cleaner electricity can therefore bring complementary benefits.

The EV–asthma paper did not separately quantify the health benefits of cleaner power generation, so we cannot simply add another number to its results. Nor do these studies assess all pollution associated with manufacturing vehicles and batteries.

Carbon dioxide and lung-damaging pollutants are different things. Climate policies and clean-air policies overlap, but their effects need separate assessment.

Reasons for hope, without overstating the evidence

Not every clean-air intervention has produced a detectable health improvement. An earlier evaluation of London’s original Low Emission Zone found modest pollution reductions but no clear improvement in children’s lung function or asthma symptoms during the study period. The later CHILL study examined a stronger policy using a different design.

Cleaner transport will not prevent every case of asthma. EVs also leave pollution from tyre and road wear that still needs attention.

Nevertheless, the evidence is encouraging in several connected ways: greater EV uptake has been associated with lower measured exhaust-related pollution; cleaner air has been associated with better lung development; and falling pollution has accompanied fewer new childhood asthma diagnoses.

These findings do not prove every step occurred in the same children, or establish precisely how many cases electrification prevents. They do show movement in the right direction.

For people who know the burden of asthma, that offers a tangible reason to keep improving the air: the possibility of more children growing up with healthier lungs, alongside the longer-term protection of our climate.

The potential benefits extend beyond asthma.

Air pollution contributes to heart disease, stroke, COPD, lung cancer and respiratory infections. Reducing exposure therefore offers opportunities to protect health throughout life—from children’s developing lungs to the hearts and lungs of older adults. These wider benefits cannot be calculated from the EV–asthma study, but they strengthen the public-health case for cleaner air.

Studies and sources

Electric vehicles and air pollution

Zero-emissions vehicle adoption and satellite-measured nitrogen dioxide air pollution in California, 2019–2023
— The Lancet Planetary Health, 2026. Observational evidence linking greater EV uptake with lower satellite-measured nitrogen dioxide.
California’s early transition to electric vehicles: Observed health and air quality co-benefits
— 2023. Associations with asthma emergency-department visits and air pollution; the nitrogen dioxide result was not statistically conclusive.

Cleaner air and children’s respiratory health

Impact of the Ultra Low Emission Zone on lung function growth in children in London: the CHILL study
— The Lancet Public Health, 2026. Compared measured lung development in children in London and Luton.
Read the research team’s plain-language explanation.
Association of Changes in Air Quality With Incident Asthma in Children in California, 1993–2014
— JAMA, 2019. Falling nitrogen dioxide and fine-particle pollution were associated with fewer new childhood asthma diagnoses.
Association of Improved Air Quality with Lung Development in Children
— New England Journal of Medicine, 2015. Measured improvements in children’s lung development as air quality improved.
Association of Changes in Air Quality With Bronchitic Symptoms in Children in California, 1993–2012
— JAMA, 2016. Additional evidence concerning respiratory symptoms, including in children with asthma.
Impact of London’s low emission zone on air quality and children’s respiratory health
— The Lancet Public Health, 2018. An earlier evaluation that did not detect clear improvements in children’s respiratory health following modest pollution reductions.

The EV–asthma estimate and its limitations

Emerging evidence for the impact of Electric Vehicle sales on childhood asthma: Can ZEV mandates help?
— Environmental Research, 2025. The US observational modelling study behind the estimate of one fewer new asthma case per 264 new EV sales.

Important: The UK figure of approximately 1,800 fewer new childhood asthma diagnoses is an illustrative calculation, not a measured UK benefit or a validated forecast. The range of approximately 1,200–4,200 carries through the US study’s reported statistical interval; it is not a confidence interval for Britain. Observational associations do not establish causation, and fewer diagnoses during a year may represent cases delayed as well as prevented.