Exceptional times require special measures and solutions. Many companies and manufacturers are reacting to the COVID-19 pandemic by not only producing their regular products like cars, consumer electronics and smartphones but also face masks. Now, Xiaomi has commenced development for a Smart Mask that can record air quality among other features.
https://www.notebookcheck.net/Xiaomi-puts-Smart-Mask-face-mask-into-development.459010.0.html