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Air purifiers may lower blood pressure in seniors near roadways

NCT ID NCT04103346

Disease control Sponsor: University of Michigan 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tested whether using HEPA air purifiers at home could improve heart health in seniors living near busy roads. Fifty-two low-income seniors aged 60 and older used either a real air purifier or a sham device for four weeks. Researchers measured their blood pressure to see if cleaner air made a difference.

What this could mean

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

Active substance
HEPA air purifier
What this could lead to
If effective, using HEPA air filters at home could help reduce heart disease risk in seniors exposed to air pollution.
What could go wrong
This was a small, early study with only 52 participants, so results may not apply to everyone. The intervention is not a treatment for existing heart conditions.

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

52 people

The number who actually took part.

Started

Feb 2020

Finished

Nov 2024

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

60 years and older

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: * Nonsmoker * ≥60 years old * residing in Carpenter Place Apartments Exclusion Criteria: * Active cigarette smoker * daily secondhand smoke exposure (self-report) * any CV event (myocardial infarction, stroke, heart failure, revascularization) in the past 3 months * unstable CV condition or risk factor (uncontrolled diabetes, class 3-4 angina or heart failure) or any medical condition that would place the participant at risk from participation or jeopardize study integrity (per investigators) * expected overnight travel outside their apartment during the 14-week study period * unable to provide informed consent * lung disease requiring oxygen * renal dialysis * cancer receiving active treatment or chemotherapy * severe uncontrolled high BP ≥160/100 mm Hg or SBP\<115 mm Hg. * CV medication change in the prior month. If participants are on medications for high BP, diabetes, or a CV condition, they will need to have stable therapy during the prior month with no planned changes during the study period.

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As listed by the trial registrant

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

Cardiometabolic health

Contacts and locations

Locations

  • University of Michigan

    Ann Arbor, Michigan, 48103, United States

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