On average, we inhale 20 lbs of air per day. This is greater by weight than the food or water we consume in a day. We should be paying a lot more attention to air quality.
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We can't even slow down the consumerism. Everyone's job around the world is someway tied into this rampant production of cheap plastic goods to replace cheap plastic goods from yesterweek. You try and nip it in the bud everyone is liable to lose their job and everything might very well collapse because of how we chose to stack this deck of cards on this planet.
You're right about building materials, but that's true regardless of the air tightness: engineered woods, all kind of glues, all kind of foams, paints, sealants, hard to tell how nasty they are but they for sure aren't beneficial.
Glues are getting better over time. Slightly nasty polyurethanes [0] and quite nasty solvent- and bitumen-based products are gradually being replaced with STPE, and STPE seems to be considered quite safe. It doesn’t even have a prop 65 warning!
[0] Polyurethane may well be harmless when fully cured, but the uncured isocyanates are most definitely nasty. Fortunately, they’re so reactive that they will aggressively react with water (even just moisture in the air) or almost any alcohol and produce much safer products.