The Airports, Air Quality, and Asthma (AAA) Study

Recruiting now · Not applicable · Has a placebo group

Conditions studied: Pediatric Asthma

In brief

For children with asthma, exposure to indoor air pollution increases the risk of a serious asthma exacerbation, which can be life-threatening. Interventions aimed at improving indoor air quality, including use of a portable air cleaner with a high-efficiency particulate air (HEPA) filter, can reduce this risk, but the effectiveness, feasibility and acceptability of HEPA air cleaners varies by setting. In collaboration with a community health worker (CHW) delivered asthma education program, the investigators are conducting a randomized clinical trial to evaluate the effectiveness of HEPA air cleaners to improve indoor air quality and child asthma health in South King County of Washington state, a vulnerable community impacted by air pollution from airports and highway traffic. Key features of the Airports, Air Quality and Asthma (AAA) design include integration of CHWs into study procedures, including CHWs recruited from community-based organizations, into multiple aspects of the trial protocol. The investigators aim to recruit up to N=60 children with asthma randomized into intervention and control groups in a 1:1 ratio, conduct baseline assessments of indoor air quality and airway health, and collect repeated assessments of air quality and airway health during the three-month intervention period and after the trial concludes. Study findings will inform future approaches to integrate HEPA air cleaners into existing CHW asthma education programs in this and similar communities.

Key facts

Study ID

NCT07047430

Run by

University of Washington

People needed

60

Starts

2024-06-01

Expected to finish

2027-06-01

Last updated by the study team

2025-07-02

Who can join

Age: 6 and older, up to 12. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Child is 6-12 years old with a health care provider-diagnosed asthma.
• Caregiver is comfortable in participating in all study activities in English (communicating with study staff by phone and completing online surveys).
• Caregiver is familiar with the child's daily asthma health.
• Residence within 10 miles of Seattle-Tacoma International Airport as determined by zip code
• Child resides in caregiver's home at least five nights a week on a regular basis and has no plans to move in the next three months.

You may not qualify if…

• Child has severe asthma at baseline. Severe asthma was defined in consultation with pediatric pulmonologists to be caregiver-reported asthma symptoms every day over the past 14 days and/or two or more inpatient hospitalizations for asthma in the past 12 months.
• Households were excluded if there were multiple individuals within the same household with asthma eligible for the King County CHW Asthma Program or had severe asthma.

Where it is running

• University of Washington — Seattle, Washington, United States (enrolling)

Full record on ClinicalTrials.gov

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