CambridgeWildfire smoke raised Los Angeles night-time coughing 13%.
Coughing also rose with fine-particle pollution below WHO guidelines, even in Melbourne and Sydney.
A sleep app counted coughs for 18 months, averaging 98,000 users a night in 32 cities, and researchers tested for flu season.
The researchers say source-specific data are needed to confirm London’s fireworks nights caused the cough rise.
Lead author Cecilia Mascolo says chronic effects of long-term low-level particle exposure warrant attention.
How each outlet framed it
- The Guardian
- quantifies night-time cough patterns via anonymized sleep app data tracking 98,000 users nightly across 32 cities
Sources: The Guardian