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Classroom air cleaners put to the test in 180 dutch schools

NCT ID NCT07479420

Knowledge-focused Sponsor: Lidwien Smit Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 2 times

Summary

This study tested whether portable air cleaners can make classroom air healthier for children. Researchers placed HEPA filter or ionization air cleaners in some classrooms and compared them to classrooms without any cleaner. They measured germs, dust, and particles in the air over several weeks. The goal was to see if these devices reduce airborne bacteria, viruses, and particulate matter that can affect kids' health and learning.

What this could mean

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

Active substance
HEPA filter air cleaners and ionization/plasma air cleaners
What this could lead to
If successful, this could show that portable air cleaners help reduce germs and dust in classrooms, potentially improving children's respiratory health and learning environment.
What could go wrong
This is an observational study, not a treatment trial. Results may not apply to other settings, and the devices might not significantly reduce illness or absenteeism.

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.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

180 people

The number who actually took part.

Started

Dec 2023

Finished

May 2025

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.

Ages

5 to 13 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: 1. Primary schools with at least three comparable classrooms between grade 3-8 2. Regular primary education classrooms 3. Primary schools located within reasonable travel distance of Utrecht, the Netherlands Exclusion Criteria: 1. Schools for special education 2. Secondary schools 3. Kindergarten classes (grade 1\&2; approximately ages 4-6 years) 4. Schools unable or unwilling to provide the required study information

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As listed by the trial registrant

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

Airborne microorganisms Particulate matter (PM)

Contacts and locations

Locations

  • Utrecht University

    Utrecht, Utrecht, 3508 TC, Netherlands