Sure. I'd be happy to jump in.
I think that strictly measuring impacts on a scientific metric like noise compression rates or decibel rates is not the only consideration. The accepted standards do not necessarily take into account concentration, for example. Having 55 decibels once every 20 minutes may be an acceptable standard, but 55 decibels or 45 decibels or any metric on a consistent, concentrated basis leads to a level of frustration and annoyance that is very hard to measure by science.
As I said in my opening statement, it's an issue of quality of life. When you are constantly bombarded with sound, whether it meets a certain standard or not, it's going to have an impact on your ability to conduct your daily activities, your sleep and your well-being.