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ClinicalTrials.gov public records Last synced Oct 22, 2026, 5:39 AM EDT

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Showing 1–24 of 29 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Clean Air exposure Clear all
Recruiting Phase 4 Interventional Accepts healthy volunteers

Woodsmoke Exposure, Influenza Infection, and Nasal Immunity

NCT06841913
View directory record Official record
Conditions
Smoke Exposure, Influenza
Interventions
LAIV nasal vaccine is chosen as a model viral infection, Wood smoke, Placebo for LAIV nasal vaccine is chosen as a model viral infection, Placebo for Wood Smoke (clean Air Exposure)
Biological · Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 49 Years
Enrollment
112 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2028
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 30, 2026 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Responses to Exposure to Low Levels of Concentrated Ambient Particles in Healthy Young Adults

NCT03232086
View directory record Official record
Conditions
Exposure to Pollution
Interventions
Clean Air, PM2.5
Other
Lead sponsor
Environmental Protection Agency (EPA)
Federal
Eligibility
18 Years to 35 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 5, 2021 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Human Biological Responses to Low Level Ozone

NCT02857283
View directory record Official record
Conditions
Environmental Exposure, Nasal Inflammation
Interventions
Ozone, Filtered Air, Health and Exposure Tracker (HET)
Other · Device
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 50 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated May 14, 2021 · Synced Oct 22, 2026, 5:39 AM EDT
Active, not recruiting Not applicable Interventional Results available

Community Mobilization for Improved Clean Cookstove Uptake, Household Air Pollution Reduction, and Hypertension Prevention

NCT05048147
View directory record Official record
Conditions
Hypertension
Interventions
Community Mobilization
Behavioral
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 85 Years
Enrollment
1,280 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
2
States / cities
Chicago, Illinois • New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 30, 2026 · Synced Oct 22, 2026, 5:39 AM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

Pulmonary and Inflammatory Responses Following Exposure to a Low Concentration of Ozone or Clean Air

NCT05680831
View directory record Official record
Conditions
Lung Injury, Acute, Symptoms and Signs, Neutrophilia Acute
Interventions
0.070 ppm ozone concentration, Clean air (0.0 ppm ozone)
Biological
Lead sponsor
Martin W. Case
Federal
Eligibility
18 Years to 35 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 11, 2023 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Results available

Promoting Risk Reduction Among Young Adults With Asthma During Wildfire Smoke Events (TRAK)

NCT04724733
View directory record Official record
Conditions
Asthma
Interventions
Smoke Sense, Smoke Sense Plus
Behavioral
Lead sponsor
Washington State University
Other
Eligibility
18 Years to 26 Years
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Spokane, Washington
Source: ClinicalTrials.gov public record
Updated Apr 28, 2023 · Synced Oct 22, 2026, 5:39 AM EDT
Suspended Not applicable Interventional Accepts healthy volunteers

Controlled Exposure of Healthy Nonsmokers to Secondhand and Thirdhand Cigarette Smoke

NCT04013256
View directory record Official record
Conditions
Pollution; Exposure, Smoke Inhalation, Exposure to Pollution
Interventions
Cigarette Smoke, Clean Air and Clean Clothing/Sham exposure
Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 50 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Aug 28, 2023 · Synced Oct 22, 2026, 5:39 AM EDT
Recruiting Not applicable Interventional

Peri-implantitis Management: Surgical and Maintenance Outcomes

NCT07550127
View directory record Official record
Conditions
Peri-implantitis
Interventions
Resective surgery with implantoplasty, Resective surgery with mechanical debridement
Procedure
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Cardiopulmonary Responses to Exposure to Ozone and Diesel Exhaust

NCT01874834
View directory record Official record
Conditions
Respiratory Depression, Blood Pressure
Interventions
ozone
Other
Lead sponsor
Environmental Protection Agency (EPA)
Federal
Eligibility
18 Years to 55 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 11, 2013 · Synced Oct 22, 2026, 5:39 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

BATokines as Biomarkers of Brown Fat in Humans

NCT05050240
View directory record Official record
Conditions
Healthy Lifestyle
Interventions
Cooling Vest Procedure, Fasting overnight
Other
Lead sponsor
Rockefeller University
Other
Eligibility
18 Years to 28 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Sequential Exposure to Nitrogen Dioxide and Ozone in Healthy Adult Human Volunteers.

NCT02133586
View directory record Official record
Conditions
Respiratory Depression
Interventions
Ozone, Nitrogen dioxide
Other
Lead sponsor
Environmental Protection Agency (EPA)
Federal
Eligibility
18 Years to 40 Years
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 17, 2020 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Efficacy of Fish Oil or Olive Oil Supplementation on the Health Effects of Ozone Exposure in Healthy Young Subjects

NCT03395119
View directory record Official record
Conditions
Healthy, Dietary Supplement
Interventions
Ozone, Fish Oil, Olive Oil
Drug · Dietary Supplement
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 35 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 15, 2021 · Synced Oct 22, 2026, 5:39 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Role of Macrophage Activation in Lung Injury Following Ozone Exposure

NCT05794087
View directory record Official record
Conditions
Air Pollution
Interventions
Clean Air, Ozone
Other
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years to 40 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Piscataway, New Jersey
Source: ClinicalTrials.gov public record
Updated Dec 17, 2025 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Wildfire Related Air Pollution Exposure and Cognitive Function Pilot Study

NCT07151235
View directory record Official record
Conditions
Healthy Participants
Interventions
Simulated wildfire smoke exposure, Clean Air exposure
Other
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years to 40 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Piscataway, New Jersey
Source: ClinicalTrials.gov public record
Updated Dec 2, 2025 · Synced Oct 22, 2026, 5:39 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Secondhand Effects of Hookah (i.e., Waterpipe) Smoke and Aerosol

NCT04661683
View directory record Official record
Conditions
Hookah Smoking, Secondhand Aerosol, Vascular Stiffness, Vaping
Interventions
Combustible Hookah Smoke, Electronic Hookah Aerosol, Clean Room Air
Other
Lead sponsor
University of California, Los Angeles
Other
Eligibility
21 Years to 49 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2027
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 22, 2026 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Epigenetic Effects of Diesel Exhaust and Ozone Exposure

NCT01492517
View directory record Official record
Conditions
Exposure to Pollution, Inhalation of Ozone
Interventions
Ozone exposure, Diesel exhaust, Ozone18, Clean Air
Other
Lead sponsor
Environmental Protection Agency (EPA)
Federal
Eligibility
18 Years to 55 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 18, 2016 · Synced Oct 22, 2026, 5:39 AM EDT
Suspended Not applicable Interventional Accepts healthy volunteers

Efficacy of Respiratory Protection Against the Effects of Wood Smoke Exposure in Young Healthy Adults

NCT06066749
View directory record Official record
Conditions
Healthy
Interventions
Filtration of all PM and VOC's, Filtration of VOC's
Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 35 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 12, 2025 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect Of Obesity On Ozone-Induced Airway Inflammation

NCT00839943
View directory record Official record
Conditions
Obesity
Interventions
ozone, 0.4 ppm
Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 35 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2012
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 27, 2012 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional

Physiological Changes in Adults With Metabolic Syndrome Exposed to Ultrafine Air Particles

NCT01475968
View directory record Official record
Conditions
Metabolic Syndrome
Interventions
Ultrafine Air Pollution Particulate Matter, Filtered Air
Other
Lead sponsor
David Diaz-Sanchez
Federal
Eligibility
25 Years to 70 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2013
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 7, 2013 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Air Pollution Study: The Effect of Ozone on the Lung

NCT02673775
View directory record Official record
Conditions
Air Pollution
Interventions
Clean Air, Ozone
Other
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years to 40 Years
Enrollment
135 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2022
U.S. locations
1
States / cities
Piscataway, New Jersey
Source: ClinicalTrials.gov public record
Updated Sep 25, 2025 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Diesel Exhaust Followed by Administration of Nasal Spray Flu Vaccine on Individuals With & Without Allergies

NCT00617110
View directory record Official record
Conditions
Allergic Rhinitis
Interventions
live attenuated influenza virus (LAIV) with clean air, LAIV and diesel exhaust particles
Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 35 Years
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2014
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 3, 2015 · Synced Oct 22, 2026, 5:39 AM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Pulmonary and Inflammatory Responses Following Exposure to a Low Concentration of Ozone or Clean Air at Rest

NCT06943989
View directory record Official record
Conditions
Lung Inflammation, Experimental Lung Inflammation
Interventions
Ozone Exposure, Clean air (0.0 ppm ozone)
Other
Lead sponsor
Environmental Protection Agency (EPA)
Federal
Eligibility
18 Years to 35 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 27, 2025 · Synced Oct 22, 2026, 5:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Ozone Cardiovascular Effects in Genetically Susceptible People

NCT01192477
View directory record Official record
Conditions
Healthy
Interventions
Ozone
Other
Lead sponsor
University of Rochester
Other
Eligibility
18 Years to 40 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Dec 4, 2013 · Synced Oct 22, 2026, 5:39 AM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Short-Term Health Outcomes of Cooking UFP Exposure

NCT07311967
View directory record Official record
Conditions
Cognitive Function Decline, Air Pollution Exposure, Respiratory Inflammation
Interventions
Clean Indoor Air Exposure (Control), Exposure to Cooking-Generated Ultrafine Particles and Gases
Other
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 31, 2025 · Synced Oct 22, 2026, 5:39 AM EDT