Quoted from DCP:
Caution! PM 2.5 is not equivalent to N95...N95 filters 95% of particles 0.3 microns or larger. PM 2.5 means 2.5 micron particles can get through.
Also don’t get the Patriot’s version if you are a healthcare worker:
“at least some and possibly many of the roughly one-million protective masks on the team plane were not the time-tested, industry-standard N95 masks that medical workers wear when treating coronavirus patients. Rather, they were a Chinese version known as a KN95 mask that some hospitals in Boston and beyond have so far declined to use and remain reluctant about today.”
The “K” may or may not stand for knockoff.