"AZ Nomad" wrote in message

If neither steam nor vacuum can free the particles, they won't become
airborn.

Maybe, but there can still be some particulate, like the outgassing of
chemical that you can't vacuum away or steam clean. Depends on what is
actually in there, how well embedded or how fast/slow it is deteriorating.
Running a vacuum cleaner over the carpet for a few minutes once or twice a
week is not the same as exposure 24 hours a day.