PM2.5 Exposure, Obesity, and Cardiovascular Health

November 2, 2026 updated by: Masako Morishita, Michigan State University

Investigating Interactions Between PM2.5 Exposure, Obesity, Cardiovascular Health and Dietary Antioxidant in Subjects With Obesity

Obesity and exposure to fine particulate matter (particles of aerodynamic diameter less than 2.5 µm, PM2.5) air pollution are established risk factors for cardiovascular (CV) morbidity and mortality. This proposed pilot project seeks to assess interactions between PM2.5 exposure, obesity, CV health, and dietary antioxidant in subjects with obesity.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

This proposed intervention study will investigate (1) whether the use of portable air filtration systems (PAFS), by lowering PM2.5 exposures, will improve CV risk factors in subjects with obesity; and (2) whether antioxidant levels will modify the association between PM2.5 exposure and blood pressure. Our project will help validate the benefits of novel strategies to employ PAFS. Positive results would represent a key step in forming the evidence base required to promote more wide-scale PAFS use; in the long term, given their low cost and burden, PAFS use could be up-scaled to help protect diverse populations.

Study Type

Interventional

Enrollment (Estimated)

20

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Michigan
      • East Lansing, Michigan, United States, 48824
        • Recruiting
        • Michigan State University
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

21 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • ≥21 years old
  • diagnosis of hypertension (BP ≥140/90 mm Hg)
  • obesity (BMI>30)

Exclusion Criteria:

  • any CV event (myocardial infarction, stroke, heart failure) in the past 3 months
  • unstable CV condition (class 3-4 angina or heart failure) or any medical condition that would place the subject at risk from participation or jeopardize study integrity (per investigators)
  • expected overnight travel outside their home during the 9-week study period
  • unable to comprehend/sign informed consent
  • lung disease requiring oxygen
  • cancer receiving active treatment or chemotherapy
  • CPAP use for sleep apnea
  • CV medication change in the prior month

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Basic Science
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Sham Comparator: Arm 1

Participants are exposed to unfiltered air (sham) via air filtration systems in the bedroom and main living space of each residence.
Device: Air filtration systems without filters (sham)

Subjects were exposed to high-efficiency filtered air.
Active Comparator: Arm 2

Participants were exposed to high-efficiency (HEPA) filtered air via air filtration systems in the bedroom and main living space of each residence.
Device: Air filtration systems without filters (sham)

Subjects were exposed to high-efficiency filtered air.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Brachial blood pressure
Time Frame: Daily for 28 days, between 8-10 AM, starting 24 hours after air filtration systems are placed
Daily for 28 days, between 8-10 AM, starting 24 hours after air filtration systems are placed

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
C-reactive protein
Time Frame: Day 1 and Day 28 of each 4-week intervention period.

Blood samples for inflammatory marker (high-sensitivity C-reactive protein)
Day 1 and Day 28 of each 4-week intervention period.
Carotenoid
Time Frame: Day 1 and Day 28 of each 4-week intervention period.

non-invasive optical measurement of skin carotenoid levels
Day 1 and Day 28 of each 4-week intervention period.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Michigan State University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

June 18, 2025

Primary Completion (Estimated)

October 31, 2026

Study Completion (Estimated)

January 31, 2027

Study Registration Dates

First Submitted

June 3, 2026

First Submitted That Met QC Criteria

November 2, 2026

First Posted (Actual)

November 9, 2026

Study Record Updates

Last Update Posted (Actual)

November 9, 2026

Last Update Submitted That Met QC Criteria

November 2, 2026

Last Verified

March 1, 2026

More Information

Terms related to this study

Other Study ID Numbers

  • CH-MSU Alliance

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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