noise level
background level

Make sure the noise level in the house is low.

This added to the noise level in the computer room.

They also provide much better protection from very high noise levels.

The noise level picked up again when the work started.

From the noise level of the crowd, everyone else thought so, too.

I could hear a little too much of their television at night, but otherwise, the noise level wasn't a problem.

My voice would give out fast at this noise level.

Not if he could produce a noise level that high.

A high noise level is a normal part of their work environment.

The noise level was such that a hearing test might be in order later.