For PM10/PM2.5, it's very good. Most filters and box fans are oversize for even a large house - you can typically get away with a CPU fan and much smaller filter and still have it clear the air to pretty much zzero PM2.5 in a few hours.

Probably minimal impact on other pollutants (VOC's, NOX, CO, etc)... Many professional air purifiers don't make any claims about those either tho.