Yeah I'm really not sure where you're getting this from. You can't really "crush" particles to smaller than 2.5 microns, and to do so, you'd have to somehow ext

Yeah I'm really not sure where you're getting this from. You can't really "crush" particles to smaller than 2.5 microns, and to do so, you'd have to somehow extract it from the emissions stream. If you can extract it from the emissions stream, why would you crush it? Just ... don't re-emit it. Manufacturers meet stringent PM standards mostly by filtering or by adding moisture, and sometimes by modifying the combustion that happens. Reducing your particle size wouldn't even help: The limit is on PM <2.5 microns. If anything, you'd be much better off somehow agglomerating your particles to be larger, which is one of the reasons adding moisture helps.