Joyful Uke
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IF the mask isn't fitted to the individual, it doesn't matter.
I spent 24 years as a firefighter/paramedic, ran the county HazMat Team, and spent 2 weeks with the Upstate NY Search & Rescue Team at Ground Zero.
If the mask you wear isn't fit tested, it may or may not work. It is like wearing a Self Contained Breathing Apparatus (SCBA) face piece with bad seal. It helps, but not necessarily enough.
-Kurt
I get that if it's not fit tested, it's likely not as good as the real deal, (assuming the real deal has also been fit tested), but helping a bit might be better than nothing at all? (I could be wrong. You've got the expertise.)
The KN95s I use do have a tight seal. I'm not using them for the situation like the West Coast fires, but as what seems to be a better alternative to either a cloth mask or a medical mask in this COVID world. But, again, you've got expertise that I don't have.