How quiet is your room?

I was wondering if anyone else out there has room treatments and is measuring the noise levels in their room without any sound. My main listening room is between 40-43 DB with just pure ambient noise. It will get lower, but the normal running range on my meter is between these numbers.

Are others out in the community finding much lower figures with a treated room?
If so, how did you get there?

Are others out there seeing much higher levels?

Thanks for the feedback.

David