HEPA filter can remove particulate pollutant below or above 0.3 um like all HEPAs can.
Here is an article on how this works: https://smartairfilters.com/en/blog/what-combination-of-air-filters-do-i-need-to-protect-against-everything/
I also attached my favorite picture here listing particles HEPA can remove. Except for gaseous contaminant, everything on this picture can be removed by HEPA.
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