Yes, the particulates are quite large and are effectively blocked by an N-95 mask. I actually use the industrial ones, with the built-in exhalation port that makes it easier to breathe. This is a one-way valve, so it keeps out the bad air, but makes it easier to exhale. It also stays drier because much of the moisture from your breath is going out of the mask.
Picture of an example below - we but them by the dozen from a big-box home improvement store and look for the NIOSH certification on each mask.

That said, wildfire smoke is also irritating to the eyes. Wearing glasses, especially wraparound ones, and using soothing (not "redness-reducing") eyedrops helps. We really like the Optiva drops in individual vials that we can carry in our pockets and use as needed.

Yes, definitely!