Interesting; I hadn't thought about air filters at all. Thanks for mentioning them! Five minutes of googling around leaves me highly skeptical the air filter mentioned in Louie's post, which you linked to, is the one anyone interested in life extension would want to buy, though; the air filter mentioned there is a "HEPA grade" filter, not a "HEPA" filter. The filter in question only claims that it can catch particles which are larger than 30 angstroms, while real HEPA filters catch at least 99.97 % of particles larger than 3 angstroms. As a quick check, this seems like it might matter since I'd expect HEPA filters to catch all of the six air contaminants the EPA mentions here, while a filter which only caught particles larger than 30 angstroms would only stand a chance of catching one of those six contaminants. Please pardon the back-of-the-envelope nature of this comment.
This thread is for asking the rationalist community for practical advice. It's inspired by the stupid questions series, but with an explicit focus on instrumental rationality.
Questions ranging from easy ("this is probably trivial for half the people on this site") to hard ("maybe someone here has a good answer, but probably not") are welcome. However, please stick to problems that you actually face or anticipate facing soon, not hypotheticals.
As with the stupid questions thread, don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better, and please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
(See also the Boring Advice Repository)