You’re not supposed to post the OK, Thanks message until after my post.
“Outgassing” and “offgassing” are both used. I think some distinguish between them based on whether the stuff coming out is part of the solid or something that it accumulated from a more concentrated earlier atmosphere, but most people use them interchangeably.
The formaldehyde problem, I read, can be improved considerably if you expose the carpet to ammonia. If you can close up the room and leave it for a day or weekend with several bottles of strong ammonia solution dumped into pans or buckets, you should convert formaldehyde that is still inside the carpet into something else (don’t know what).
You can speed up all the outgassing by having the temperature higher.
You can leave the carpet in a roll and wrap it in plastic and suck air through the thing like a giant cigarette, so you can drive off the strongest earliest outgassing someplace other than your living space.
You can also throw a polyethylene painting tarp over it and suck air from the center of this and out a vent, concentrating the nasty things away from your living space.
Obviously I have occupied myself obsessing over this exact problem…