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It would have been an excellent idea in Southern California not that long ago — a good mask massively reduces PM2.5, and PM2.5, especially on So Cal freeways, w
by amluto 2y ago
It would have been an excellent idea in Southern California not that long ago — a good mask massively reduces PM2.5, and PM2.5, especially on So Cal freeways, was quite high.
- jerlam 2y agoCabin air filters, which are in many if not most modern cars, should already have removed the particulates already.
- amluto 2y ago“Should have” is, at best, wishful thinking. In air filtration, a good rule of thumb is that, if an actual quantitative spec isn’t given, then the filter doesn’t filter. I’ve seen this with expensive commercial systems with stamped plans, I’ve seen it with very fancy European IAQ systems, and I’ve seen it with cars. Seriously, go look for a stated spec for a cabin air filter, which you generally won’t find, then drive on a freeway, bring a PM2.5 meter, and compare windows open to windows closed.