What bothers me is that we only regulate the loudest offenders (cars, motorcycles, construction), while the residual of everything else is just accepted as background. But that background adds up.
I wish we had stricter regulations not only for peak noise but also for the residual noise emitted by everyday objects. If reducing a few decibels here and there became a design goal across the board, the cumulative effect on quality of life in cities would be enormous.