N95 masks are not sufficient to protect the wearer against airborne COVID, although they substantially reduce community transmission if everyone has one.

Will a P100 mask, purchased from Home Depot, protect the wearer from COVID-19 infection (the current winter 2024 strain) if e.g. they were in a bus or airplane where 20% of the passengers were transmitting the virus? Assume that the wearer is wearing gloves and will not touch their face or eyes during or after the trip.

I will not bet in this market.

EDIT: Just to clarify, it has to prevent transmission in that description, not reduce the probability by some small amount. There should be a <0.5% chance of catching COVID through the mask (properly fitted and used) in that situation.