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

NCT ID NCT04695093

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

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.

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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

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