London's clean-air zone gave children their lungs back

Nearly 1,700 London children were tracked against a matched group in Luton. Before the ultra-low emission zone, the London kids had significantly smaller lungs. By 2022 the gap had closed. Meanwhile the US EPA is proposing to weaken 2027 diesel truck standards affecting 72 million Americans.

Nearly 1,700 children. Two towns. One policy.

Researchers at Queen Mary University of London measured the lungs of nearly 1,700 children in London and a similar number in Luton — a town with a comparable mix of traffic pollutants and no clean-air zone. They tracked them from before London's ultra-low emission zone came in through to 2022.

At the start, the London children had significantly smaller lungs than the Luton children. By the end, the London children's lung capacity had improved to roughly equal.

That is the result, published in the Lancet Public Health. Not a model. Not a projection. Children's bodies, measured, in two real places, before and after a policy that pushed the dirtiest engines out of a city.

The team also found that the level of nitrogen dioxide children were exposed to fell faster in London than in Luton over the same period. Researchers say that is key.

This should have been front pages everywhere. It got a fraction of the coverage that a single burning electric car gets.

What exhaust does to a lung that is still being built

Air pollution can stunt the growth of young children's lungs, leaving them at increased risk of asthma, heart disease, diabetes and premature death. Children are more vulnerable because their lungs and immune systems are still developing — and because, outside, they are closer to the ground and nearer to exhaust pipes.

One of the researchers put the scale of it plainly: there are more than a billion children living in cities around the world, most in polluted environments, "getting a really bad start in life."

In 2020, a nine-year-old girl from London who died following an asthma attack in 2013 became the first person in the UK to have air pollution listed as a cause of death. That is a coroner's finding, not an activist's slogan.

The caveat, stated plainly

Independent researchers quoted by the BBC caution that other factors must also be considered. This is an observational study with a comparison town, not a randomised trial. Nobody can hand you a clean counterfactual London.

We are saying that out loud because it matters. The finding is strong, it is peer-reviewed, it involved researchers from the Universities of Bedfordshire, Oxford, Cambridge, Edinburgh and Southern California — and it is still one study with limits. Treat it as what it is: the best available evidence that cleaning the air lets children's lungs recover, with the usual epidemiological humility attached.

What it is not is controversial in direction. Nature has published research titled "Daily exposure to fine particulate matter from traffic increases cancer mortality risk" and, separately, on the global cancer burden associated with long-term exposure to ambient air pollution. The traffic-PM2.5 literature is not a coin flip.

Indoor air: the same combustion, in your kitchen

The Guardian's summary of the current evidence is worth reading in full. Globally, about 3 million people a year die prematurely from indoor air pollution, largely from solid fuels and biomass in developing countries — which is why the International Energy Agency's clean cooking campaign has drawn more than $3bn in pledges.

In developed countries, the source is different and the physics identical. New studies cited by the Guardian show 40,000 Europeans die prematurely each year from the pollutants gas stoves emit. A switch to electricity would benefit health.

Burning hydrocarbons in an enclosed space you sleep above is a choice, not a law of nature.

And the regulators are going the other way

In February 2026, the US Environmental Protection Agency repealed the endangerment finding. Resources for the Future has modelled what removing greenhouse gas standards for light-duty vehicles does between 2026 and 2050, noting the Trump EPA made three major changes to its benefit-cost analysis that depart from best practices.

The same agency is now proposing to weaken the 2027 clean-truck standards, affecting 72 million Americans exposed to diesel pollution linked to severe health impacts.

So: London measured children's lungs getting bigger after taking dirty engines out of the air, and Washington's response is to keep more diesel in it. Those two facts belong in the same paragraph, permanently.

Everyone else is moving

Norway, August 2026: of 13,451 newly registered cars, 13,274 were battery electric — 98.7%. Exactly 30 petrol-only cars were registered, a 0.2% share, plus 64 diesels. Year to date, BEVs are 97.8% of the market. And OFV's chief says the honest thing: future CO2 and NOx cuts now depend on how fast the old petrol and diesel cars leave the fleet, which will take time. New-car statistics are not fleet statistics.

China, Q2 2026: emissions fell 1%, and for the first time ever a drop in oil use was enough to drive the decline on its own — despite coal use rising. The largest fall came from petrol, diesel and jet fuel. EV charging volumes rose 60%. Rail passenger traffic rose 5%. In July, NEVs passed 60% of domestic vehicle sales for the first time.

Ho Chi Minh City has proposed restricting petrol and diesel vehicles in its downtown from July 2027, across roughly 930 hectares, expanding inside Ring Road 2 from early 2029.

The bill nobody sends

The report Counting The Cost of Fossil Fuels in the Pacific found fossil fuels cost Pacific nations between 10 and 25 per cent of economic output — more than the regional average spend on education (8%) and health (6%). Those nations contribute 0.03 per cent of global emissions.

As Tuvalu's climate change minister put it: every dollar not spent on diesel is a dollar for health and education.

That is the whole argument in one sentence. Combustion is not free. It is billed to lungs, to hospital budgets, to import balances, and to children who grow up with smaller lungs than they should have had.

Nearly 1,700 children in London had smaller lungs than children in Luton. Then the dirty engines were pushed out, and the gap closed. Every argument for keeping combustion has to get past that measurement first.

Straight answers

Did London's ULEZ actually improve children's health?

A study by Queen Mary University of London, published in the Lancet Public Health, measured nearly 1,700 children in London against a similar number in Luton, a town with comparable traffic pollution and no clean-air zone, from before the ultra-low emission zone was introduced until 2022. The London children started with significantly smaller lungs and ended with roughly equal lung capacity. Nitrogen dioxide exposure also fell faster in London than in Luton. Independent researchers caution that other factors must also be considered, as this is an observational comparison rather than a randomised trial.

How many people die from indoor air pollution?

About 3 million people a year globally die prematurely from indoor air pollution, largely from solid fuels and biomass in developing countries, according to figures cited by the Guardian in August 2026. Separately, new studies indicate 40,000 Europeans die prematurely each year from pollutants emitted by gas stoves. The International Energy Agency's clean cooking campaign has attracted more than $3bn in pledges.

How many Americans are affected by the EPA's proposed rollback of diesel truck standards?

The Trump EPA's proposal to weaken the 2027 clean-truck standards affects 72 million Americans exposed to diesel pollution linked to severe health impacts, according to Forbes reporting from August 2026. The EPA separately repealed the endangerment finding in February 2026, which removes greenhouse gas emissions standards for light-duty vehicles.

What share of new cars in Norway are electric in 2026?

In August 2026, battery-electric vehicles were 98.7% of Norway's new car registrations: 13,274 of 13,451 new cars. Just 30 petrol-only cars were registered (0.2%) and 64 diesels (0.5%). Year-to-date through August 2026, BEVs took 97.8% of the new passenger car market. Norway's OFV notes that further CO2 and NOx cuts now depend on how fast older petrol and diesel cars leave the existing fleet.

How much do fossil fuels cost Pacific island nations?

The report Counting The Cost of Fossil Fuels in the Pacific found fossil fuels cost each Pacific nation between 10 and 25 per cent of economic output — more than the regional average spent on education (8%) or health (6%). Those same nations contribute 0.03 per cent of global emissions while being among the most vulnerable to cyclones and rising sea levels.