Paper sensors and smartphone app monitor personal smoke exposure
Peer-Reviewed Publication
Updates every hour. Last Updated: 13-Sep-2025 17:11 ET (13-Sep-2025 21:11 GMT/UTC)
An inexpensive paper sensor along with a smartphone-based reader developed by a Washington State University-led team can rapidly provide information on a person’s personal smoke exposure during wildfire season.
Engineers from Australia and China have invented a sponge-like device that captures water from thin air and then releases it in a cup using the sun’s energy, even in low humidity where other technologies such as fog harvesting and radiative cooling have struggled.
The water-from-air device remained effective across a broad range of humidity levels (30 – 90%) and temperatures (5 – 55 degrees Celsius).