Starting a new discussion as requested:
Dust Be Gone filters down to 3 microns and is not OSHA or NIOSH approved according to their website
http://www.dustbeegone.com/dustmask.html
At least that's what it looks like to me.
The RZ mask with the F3 filter will filter down to .1 micron
https://rzmask.com/pages/how-to-choose-your-mask