The short answer is yes, they're still fine to wear...
User introverted_PEA, in the Masks4All subreddit,
The short answer is yes, they're still fine to wear Sources for the below: https://pmc.ncbi.nlm.nih.gov/articles/PMC8027558…
Filtration evaluation of expired elastomeric P-100 filter cartridges after months of real-world use during the coronavirus disease 2019 (COVID-19) pandemic
Overview of attention for article published in Infection control and hospital epidemiology (Online), March 2021
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In the top 25% of all research outputs scored by Altmetric
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High Attention Score compared to outputs of the same age (81st percentile)
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Good Attention Score compared to outputs of the same age and source (70th percentile)
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