I'm a bit late to the mask discussion but I've read that the effectiveness of the normal medical masks can be as low as 38.5%.
https://healthtalk.unchealthcare.org/not-all-masks-are-created-equal/
This is so much lower than all the previous figures we've been given for these but it's from a test done by the EPA.
Mitre10 has KN95's but they only have ear loops which seems to be the issue.


