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London's low emission zone linked to healthier lungs in children

NCT ID NCT04695093

Knowledge-focused Sponsor: Queen Mary University of London Source: ClinicalTrials.gov ↗

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looked at whether London's Ultra Low Emission Zone (ULEZ) — which charges polluting vehicles — improves children's lung health. Researchers tracked lung function in over 3,300 children from schools inside and outside the zone over 4 years. They also measured air pollution levels to see if cleaner air leads to better breathing.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If successful, this could show that reducing traffic pollution improves children's lung development, supporting cleaner air policies worldwide.
What could go wrong
This is an observational study, not a controlled trial, so other factors (like weather or lifestyle) could influence results. It measures association, not proof of cause and effect.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

3,312 people

The number who actually took part.

Started

Jun 2018

Finished

Jul 2023

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Children aged 6-9 yrs old, recruited in 40 London primary schools (years 2, 3, 4) within the Central London ULEZ area and Children aged 6-9 yrs old, recruited in 40 Luton primary schools (years 2, 3 4).

Ages

9 to 9 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Inclusion criteria for schools: * Primary schools within, or with catchment areas that include, the Central London ULEZ. * Primary schools within the Borough of Luton and town of Dunstable. * State or independent sectors. Inclusion criteria for children: • Children attending a study school, in years 2, 3, or 4, at study inception. Exclusion Criteria: * Exclusion criteria for schools: * Schools that are not primary schools within the above boundaries. Exclusion criteria for children: * Children with learning or physical disabilities sufficient for them to be unable to give informed assent to the study, or to carry out study procedures. * Children with major lung disease (not including asthma).

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Conditions

The condition(s) this trial relates to.

Respiration Disorders respiratory system disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Child development Pollution; exposure Respiratory disease

Contacts and locations

Locations

  • Queen Mary University of London

    London, E1 2AB, United Kingdom

More trials for these conditions

Other studies related to the condition(s) this trial covers.