1) You're pretty much just screwed unless you're both very wealthy and make this topic your primary hobby/past-time. To really answer this you'd need to do an i

1) You're pretty much just screwed unless you're both very wealthy and make this topic your primary hobby/past-time. To really answer this you'd need to do an incredible amount of testing. Like buy 10 of everything you're considering and send off to labs for $100,000 of tests. Or install a million dollars of chemical air quality monitors in and around your home. 2) Large activated carbon air scrubbers. For air filtration you really need not just HEPA particulate filters, but robust VOC capture. The tiny bit of activated carbon in things like a Winix C535 or Coway Mega/AirMega really don't clean much. Instead, consider something like buying two 10"-12" carbon scrubbers from https://terra-bloom.com https://terra-bloom.com and get a matching size of their in-line "Silenced Ultra Quiet EC Fan". You can just stack these three items together and it forms a tall but not horribly ugly appliance that doesn't take up much floor space. You'd probably need to replace the filters once a year, and have quite a few around a normal-sized house, just like standalone HEPA filters (which you'd also probably still want as well). 3) Wash everything often - bedding, clothes, carpets, floors, walls, appliances, etc. Obviously, attempt to use a soap that won't add additional pollutants. Wash them twice, once with soap then again without soap. 4) Time. Assuming similar materials, something that is 5 years old should have already leeched out a lot of the chemicals which are going to off-gas/transfer/leech from it. So the polluting rate of something 5 years old that's been washed 50 times and already worn and broken in should be assumed to be lower than an identical, new, version of the same thing.