"bad stuff" in this case is combustion gas from natural gas appliances, sewer gas from sucking the water out of toilets, etc. So no, there's no end to the "bad

"bad stuff" in this case is combustion gas from natural gas appliances, sewer gas from sucking the water out of toilets, etc. So no, there's no end to the "bad stuff" they generate. Separately, offgassing is an issue for sofas and mattresses, anything made of particle board as well, but if you put them in a low pressure environment, it doesn't drastically accelerate offgassing. If they offgas formaldehyde, they're going to keep doing it after the low pressure period has ended, so better to avoid those materials altogether.