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ClinicalTrials.gov public records Last synced Oct 20, 2026, 2:25 PM EDT

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Showing 1–24 of 57 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Clean Air Clear all
Completed Not applicable Interventional Accepts healthy volunteers Results available

Human Perception of Odors and Odor Blockers

NCT06191419
View directory record Official record
Conditions
Tobacco Smoking, Smoking Behaviors
Interventions
Odorants
Other
Lead sponsor
Tim McClintock
Other
Eligibility
18 Years to 60 Years
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Jul 23, 2026 · Synced Oct 20, 2026, 2:25 PM 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 20, 2026, 2:25 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Treatment of Peri-implant Mucositis and Supportive Peri-implant Therapy

NCT06137846
View directory record Official record
Conditions
Peri-implant Mucositis
Interventions
Air-Polish, Ultrasonic
Device
Lead sponsor
University of Michigan
Other
Eligibility
18 Years to 85 Years
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Aug 24, 2025 · Synced Oct 20, 2026, 2:25 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Interaction Effects of Temperature and Ozone

NCT01981135
View directory record Official record
Conditions
Exposure to Environmental Pollution, Non-occupational
Interventions
Clean Air, Ozone
Other
Lead sponsor
Environmental Protection Agency (EPA)
Federal
Eligibility
18 Years to 55 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2015
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 10, 2015 · Synced Oct 20, 2026, 2:25 PM EDT
Completed Not applicable Interventional

Acupuncture for the Prevention of Emergence Delirium in Children Undergoing Myringotomy Tube Placement

NCT02383004
View directory record Official record
Conditions
Delirium, Psychomotor Agitation
Interventions
Acupuncture
Other
Lead sponsor
Oregon Health and Science University
Other
Eligibility
1 Year to 6 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jan 18, 2017 · Synced Oct 20, 2026, 2:25 PM 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 20, 2026, 2:25 PM 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 20, 2026, 2:25 PM 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 20, 2026, 2:25 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Comparative Efficacy of Water & Indigo Carmine vs. Water or Air Method on Adenoma Detection Rate (ADR) - a Randomized Controlled Trial (RCT)

NCT01607255
View directory record Official record
Conditions
Colorectal Neoplasms
Interventions
Indigo carmine, water (exchange) method, water (exchange) plus dye method, air method
Drug · Procedure
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
45 Years to 75 Years
Enrollment
480 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2017
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Jan 15, 2019 · Synced Oct 20, 2026, 2:25 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Encouraging LPG Adoption in Ghana: A Factorial Randomized Clinical Trial to Enhance LPG Adoption & Sustained Use

NCT03352830
View directory record Official record
Conditions
Behavior, Consumer, Health Knowledge, Attitudes, Practice, Health Attitude
Interventions
RANAS Behavior Change Intervention, Infrastructural Intervention - Direct Delivery
Behavioral · Other
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older · Female only
Enrollment
781 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 31, 2019 · Synced Oct 20, 2026, 2:25 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Epigenetic Effect Modifications With Ozone Exposure on Healthy Volunteers

NCT02469428
View directory record Official record
Conditions
Exposure to Environmental Pollution, Non-occupational
Interventions
Clean air, Ozone
Other
Lead sponsor
Environmental Protection Agency (EPA)
Federal
Eligibility
18 Years to 40 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2018
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 30, 2019 · Synced Oct 20, 2026, 2:25 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Clean Air Study: HEPA Purifiers to Improve Indoor Air Quality and Health in Rural Alaska Homes

NCT06534385
View directory record Official record
Conditions
Air Pollution, Indoor
Interventions
Air purifier
Device
Lead sponsor
Alaska Native Tribal Health Consortium
Other
Eligibility
Up to 5 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Bethel, Alaska
Source: ClinicalTrials.gov public record
Updated Feb 27, 2025 · Synced Oct 20, 2026, 2:25 PM 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 20, 2026, 2:25 PM 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 20, 2026, 2:25 PM 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 20, 2026, 2:25 PM EDT
Completed Not applicable Interventional

Unsedated Colonoscopy for Colorectal Cancer Screening and Surveillance

NCT01383252
View directory record Official record
Conditions
Colon Polyp
Interventions
Water infusion in lieu of air insufflation, Air method
Procedure
Lead sponsor
VA Northern California Health Care System
Federal
Eligibility
50 Years to 75 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Mather, California
Source: ClinicalTrials.gov public record
Updated Jun 17, 2013 · Synced Oct 20, 2026, 2:25 PM 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 20, 2026, 2:25 PM EDT
Completed Not applicable Interventional Results available

Residential Cleaning of Indoor Air to Protect COPD Patients

NCT03750292
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease
Interventions
HEPAirX air filter, control air filter
Device
Lead sponsor
University of Rochester
Other
Eligibility
18 Years and older
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Jun 1, 2022 · Synced Oct 20, 2026, 2:25 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Wood Stove Interventions and Child Respiratory Health

NCT02240134
View directory record Official record
Conditions
Lower Tract Respiratory Infection
Interventions
Education Intervention (Tx1), Air Filtration Unit Treatment (Tx2), Placebo Intervention (Tx3)
Behavioral · Device
Lead sponsor
University of Montana
Other
Eligibility
Up to 5 Years
Enrollment
523 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2020
U.S. locations
1
States / cities
Missoula, Montana
Source: ClinicalTrials.gov public record
Updated Jun 22, 2022 · Synced Oct 20, 2026, 2:25 PM EDT
Recruiting Phase 3 Interventional

Multi-Center Clean Air Randomized Controlled Trial in COPD

NCT06376994
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease (COPD)
Interventions
Air cleaner, Sham air cleaner
Device
Lead sponsor
JHSPH Center for Clinical Trials
Other
Eligibility
40 Years and older
Enrollment
770 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
11
States / cities
Birmingham, Alabama • Los Angeles, California • Iowa City, Iowa + 7 more
Source: ClinicalTrials.gov public record
Updated Jul 31, 2026 · Synced Oct 20, 2026, 2:25 PM 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 20, 2026, 2:25 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Caries Detection With Two Different Caries Detecting Devices

NCT06152081
View directory record Official record
Conditions
Caries,Dental
Interventions
LumiCare rinse, QLF Inspektor Pro Imaging
Device
Lead sponsor
Tufts University
Other
Eligibility
21 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 5, 2025 · Synced Oct 20, 2026, 2:25 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Evaluate the Ability of Sunscreen Products to Modulate the Effects of Deep UVA +/- HEV Blue Light Induced Pigmentation and Biomarkers of Cutaneous Oxidative Stress

NCT07695753
View directory record Official record
Conditions
Pigmentation, Oxidative Stress
Interventions
Sunscreen application #1, Sunscreen application #2
Other
Lead sponsor
Kenvue Brands LLC
Industry
Eligibility
18 Years to 60 Years · Female only
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Union, New Jersey
Source: ClinicalTrials.gov public record
Updated Jul 10, 2026 · Synced Oct 20, 2026, 2:25 PM EDT
Enrolling by invitation Not applicable Interventional

Efficacy of Non-surgical and Surgical Surface Decontamination Methods on Peri-implantitis-affected Implants

NCT06430268
View directory record Official record
Conditions
Peri-Implantitis, Dental Implant Failed
Interventions
implant decontamination with titanium curette, implant decontamination with Air-Flow device
Procedure · Device
Lead sponsor
Andrea Ravida
Other
Eligibility
18 Years to 80 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 18, 2026 · Synced Oct 20, 2026, 2:25 PM EDT