Optimal use time for face coverings to mitigate COVID-19 transmission

In a paper published by the Journal of Hazardous Materials, researchers from Surrey's renowned Global Centre for Clean Air Research (GCARE) explore two key questions: how long a mask should be worn; and when should it be discarded, recycled or washed to optimize its usage time.

source https://medicalxpress.com/news/2021-08-optimal-mitigate-covid-transmission.html