nice easy experiment is to take a couple pieces of wood put one in a zip lock and the other next to it on the counter and see which one decays faster. (dont cheat let both bits of wood sit out for a week so the contamination and moisture are the same) if you want another variable put another bit of wood in a baggy and a soda straw seal up the baggy around the soda straw so the only way the wood gets air is through the straw. or you can go down to the local wooden boat yard and talk to the folks about rot problems in wood boats. what you are going to hear is lots and lots about air flow and moisture exchange.
hmm wonder why? might be cause molds dont like airflow and they dont like dry. come to think of it carbon monoxide dont like air flow either nor do the several hundred gasses that come out of the materials used in the modern home. if they cant accumulate in a nice dead zone your exposure risk goes down.