Do you refer to tools like noise cancelling earphones? Or something similar for the eyes? Because when it comes to unwanted contact to people, in reality there is a duplex channel: You can talk to annoying peoples, make them stop talking. Or dont you want to look at ads in public space?

This question is really context based. In NYC one might have different problems then on the countryside. I never suffered from ads in the public space because I just ignore them. AdBlock included in the brain...