Summary
Reviewing studies from 1990 to August 2025, the authors report that air purifiers lower indoor pollution and bring respiratory and cardiovascular benefits, mostly in high-risk groups. Evidence for brain and cognitive outcomes is thin, and the studies differ widely in design.
Key points
- The authors report that air purifiers significantly reduce indoor pollution levels.
- They report respiratory and cardiovascular benefits, especially in high-risk groups.
- Evidence for brain and cognitive outcomes remains limited.
- The authors describe air purifiers as potentially cost-effective, while noting wide differences in study design.
- Design: systematic review of studies published from January 1990 to August 2025, focused on air pollution rather than infection.