Cabin Air Filter Data

I can find dozens of cabin air filters for my car, but only Bosch reports anything about the efficiency of their filters. Is there any data anywhere about the efficacy of various cabin air filters? I spend about 12 - 15 hours a week in traffic and the better I can filter the air I'm breathing in my car the longer I'm likely to live.

As far as I know Bosch is the only true HEPA cabin air filter. They don't report a filter that will fit the 2018 Prime, but I'm wondering if the 6055C will fit since it fits Gen 4 Prius.

 

I physically verified that the Bosch 6055C filter is the identical size of the OEM filter. The only thing is the pleats run the "wrong" direction. Modifying the plastic holder is easy and solves the problem. Now I can have HEPA cabin air filter.

 

Correct. It doesn't matter for filtration purposes, but you can't insert it into the plastic holder until you cut off the tongue that requires pleats oriented in a certain direction.

I did notice that the fit wasn't 100% precise. The Bosch filter is about 2mm wider so it bunched up a little tiny bit in one corner. It was very small, though. I was able to press it flat. I'm willing to do a little work every year or so to get HEPA-level filtration, though.

 

It may slow airflow a little. They just work by having pore sizes small enough to catch particles 0.3 microns and larger. PM 2.5 are like boulders to a HEPA filter.