If you share walls, you probably share noise. If you get a lot of unwanted noise from your neighbors, they’re probably getting some of your noise, too. Ask if they’re bothered by anything and let them know what you hear,
April 25th, 2018 is International Noise Awareness Day — dedicated to raising awareness of the effects of noise on public health. For those in the USA, the Acoustical Society of America invites everyone to participate for the entire month of
Vintage noise-control information Maybe you don’t have a immediate need for it, but the web offers historical references for acoustical applications. You can find some of it in the public domain at the Internet Archive. Some of the documents are