1 of 1
Story summary
- University of Cambridge researchers reported that fine-particle pollution increased nighttime coughing among sleepers.
- Each 10 µg/m³ rise in PM2.5 was associated with a 2.4% increase in nightly coughs.
- During January 2025 Los Angeles wildfire smoke, PM2.5 rose 8.5 µg/m³ and coughing rose 13%, with a 9.9% cough increase per 10 µg rise.
- Researchers concluded no safe pollution threshold exists and urged reductions even below WHO guidelines.