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April 16, 2026Journal of Environmental Science and Health Part A

Indoor environmental health and asthma relief: findings from a longitudinal HEPA filter trial

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Authors

LLLing LiXLXingfei LvHJHandi Jia

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Overview

Longitudinal trial evaluates HEPA filter impact on asthma outcomes in adults, suggesting significant benefits.

Key Points

  • This study aims to assess the clinical benefits of HEPA H14 air cleaners in improving asthma-related health outcomes and indoor air quality.
  • Conducted a randomized controlled trial with 100 adults having moderate-to-severe asthma.
  • Participants were assigned to either active HEPA H14 air purifiers or placebo for eight months.
  • Measured indoor air pollutants and clinical outcomes at baseline, 4 months, and 8 months.
  • Active HEPA group showed a significant improvement in Asthma Control Test score (β = 2.2, p = 0.004).
  • Increased symptom-free days by 27.7% (P < 0.001) in the active group compared to placebo.
  • Marked reduction in PM2.5 levels by 29.6 µg/m³ (P < 0.001) in the HEPA group.

Cite This Study

Li et al. (2026) studied this question.

synapsesocial.com/papers/69e07d732f7e8953b7cbe543https://doi.org/10.1080/10934529.2026.2655125
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