We updated the design of this site on December 18, 2017. Learn more.
ClinicalTrials.gov Menu

The Effect of Low Level Ozone Exposure on Healthy Volunteers (Lowoz)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT00468221
Recruitment Status : Withdrawn (Lack of funding)
First Posted : May 2, 2007
Last Update Posted : May 29, 2015
Information provided by:

Study Description
Brief Summary:
The purpose of this research study is to learn more about the effects of 0.12 ppm ozone exposure on humans. We know from other studies that exposure to levels of ozone that are seen on bad air pollution days, can cause an increased risk of illness and even death in some people with certain health problems like asthma and heart disease. We also know from studies we have done in our lab that even healthy people can have an inflammatory (an increase in the amount of bacteria fighting cells) response to high levels of ozone. We suspect that exposure to low levels of ozone makes the body more susceptible to things like allergens. For instance, in persons allergic to pollen, exposure to ozone in the environment may cause them to have more allergy symptoms when they are around pollen than they would have if they were not exposed to ozone first. In this study we are looking to find the lowest level of ozone to which healthy people can be exposed without seeing that increased immune response. We will use 0.12 ppm ozone; this is roughly the amount of ozone you would be exposed to on a "yellow" ozone day in the triangle area in the summer if you spent the entire day out of doors and exercising moderately.

Condition or disease Intervention/treatment Phase
Healthy Drug: Ozone Exposure Phase 1

  Show Detailed Description

Study Design

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 0 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Basic Science
Official Title: The Effect of Low Level Ozone Exposure on Healthy Volunteers
Study Start Date : June 2009
Primary Completion Date : November 2009
Study Completion Date : November 2009

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Ozone
U.S. FDA Resources

Arms and Interventions

Intervention Details:
    Drug: Ozone Exposure
    Low dose ozone exposure in chamber

Outcome Measures

Primary Outcome Measures :
  1. Inflammatory markers in sputum [ Time Frame: post exposure ]

Eligibility Criteria

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Ages Eligible for Study:   18 Years to 40 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy Adult
  • Nonsmoker
  • Able to perform light exercise

Exclusion Criteria:

  • Asthma
  • active allergies
  • chronic disease
Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00468221

Sponsors and Collaborators
University of North Carolina, Chapel Hill
Environmental Protection Agency (EPA)
National Institute of Environmental Health Sciences (NIEHS)
Principal Investigator: Bradford Harris, MD University of North Carolina
More Information

Responsible Party: Bradford Harris, MD, UNC_Chapel Hill
ClinicalTrials.gov Identifier: NCT00468221     History of Changes
Other Study ID Numbers: 07-0304
R01ES012706 ( U.S. NIH Grant/Contract )
First Posted: May 2, 2007    Key Record Dates
Last Update Posted: May 29, 2015
Last Verified: May 2015

Keywords provided by University of North Carolina, Chapel Hill:
Healthy Adults