Categories Uncategorized Coronavirus; masks; FFP2 or FFP3; An upper bound on one-to-one exposure to infectious human respiratory particles Post author By Pete's Library Post date December 5, 2021 No Comments on Coronavirus; masks; FFP2 or FFP3; An upper bound on one-to-one exposure to infectious human respiratory particles twitter.com/dickzoutman/status/1467303435192184834 Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Like Loading... ← Coronavirus: hippos test positive → Coronavirus: how to protect oneself Leave a comment Cancel reply Δ
Pete's Library 