How big is the SARS-CoV-2 virus particle? An N95 mask is supposed to filter out 95% of PM 2.5 particles (2.5 ?m)

The only thing I could find is about coronaviruses in general, not SARS-CoV-2 specific:

https://microbewiki.kenyon.edu/index.php/Coronavirus

> The virion shape is spherical, with an average size of 125 nm

Why are all these panicky idiots hoarding N95 masks if the virus is 0.125?m, or is the size wrong?