Hello -
I barely use A/C so my issue is usually is what's coming through the open window. When I'm on the freeway, I usually wear these :
BreathePure™ Nasal Air Filter
Quote:
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As seen in the above chart, BreathePure NAF removes 97% of the particles 7 microns and larger. This includes particles associated with pollen, sneezes, and dust mites, as well as a majority of particles from fungi and spores, human hair, household dust, and pet dander.
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I think this does help a bit because my route includes "Diesel Alley", the 710 freeway to/from Long Beach Harbor.
At least it claims to put a dent in the PM10 particulate. I tried a facemask but that was too hot.
CarloSW2