Here is the noise Profile of a UMIK-1.
In order to capture this data I had to use all the noise-blocking resources available to me.
Starting with 8 1cuft corner traps to make a make-shift anechoic chamber, inside my already soundproof theater, at 4am on a winter night.
I stuck my head in there to confirm the SPL. I would say it was 1-4db ish.
Here is the RAW noise profile file I captured, you can use this as a generic sampler for a noise reduction filter (if you ever need one, and want one that is decently well recorded).
Here is what I recorded amped to 0dbFS.
The only source of noise that the mic "seems" to be detecting is perhaps some sort of distant train perhaps 1-3 miles away. 15-40hz is all that remains after it goes through all the soundproofing.
Here is what it sounds like outside, direct exposure. I had to block all that!
Damn humans! That's only a few cars. I could only imagine how noisy New York or LA would be!!!!! (20 million cars?)