Summary
Across 62 studies from 2020 to 2025, mechanical ventilation with good filtration was linked to lower CO2, fewer airborne particles and less infection or absence. Natural ventilation worked unevenly, depending on climate and window use.
Key points
- Design: PRISMA scoping review mixing trials, observational and modelling studies, so it shows association more than proof.
- Funding: none stated; authors declare no conflicts.
- Added from the October 2026 literature sweep, from the abstract; curators to check against the full text.