I cannot find any credible science regarding the effectiveness of N95 or non-N95 masks for avoiding viral contamination.

There have been extensive randomized controlled trial (RCT) studies, and meta-analysis reviews of RCT studies, which all show that masks and respirators do not work to prevent respiratory influenza-like illnesses, or respiratory illnesses believed to be transmitted by droplets and aerosol particles. 

https://www.researchgate.net/publication/340570735_Masks_Don’t_Work_A_review_of_science_relevant_to_COVID-19_social_policy

Dr. Russell Blaylock warns that not only do face masks fail to protect the healthy from getting sick, but they also create serious health risks to the wearer. The bottom line is that if you are not sick, you should not wear a face mask.

https://www.technocracy.news/blaylock-face-masks-pose-serious-risks-to-the-healthy/

The Prime Minister of Sweden Stefan Lofven has advised against wearing face masks to ward off Covid-19, as they may lead people to assume they are safe from the virus when there is still a risk of transmission.

https://www.rt.com/news/488567-sweden-pm-face-masks-coronavirus/

The primary reason for mandating the wearing of face masks is to protect dental personnel from airborne pathogens. This review has established that face masks are incapable of providing such a level of protection.

https://www.oralhealthgroup.com/features/face-masks-dont-work-revealing-review/

OK, maybe a mask will possibly keep you from contaminating other people. Better yet, if you’re not feeling well, how about stay home instead?

And no mask is effective if you are a man with a beard. I have sported a beard since 1972, and I don’t believe I need to change my appearance because of a nasty cold virus.

Masks are very effective at creating social discomfort. Humans have always relied on facial expressions of other humans to detect fear, anger, danger, contentment, etc. A masked population negates all of that. People are already pretty nervous what with politicians willfully destroying people’s livelihoods, and masks are adding to the distress without apparently providing much benefit.