Another thing is advertisement pollution. Just notice it when going around in some bigger cities. Ads everywhere, shouting at you and not letting you to rest. Even if you don't look at them, they are still there, talking to you.
"Science says quiet is good for you."
"Finland is a place that is quiet."
"You should go to Finland."
It's not even subtle but I didn't see it mentioned in these comments at all.
HYPER-REALITY[0] is a fun exploration of ad pollution in AR. Of course one can use similar tech to support quiet.
[0] https://www.youtube.com/watch?v=YJg02ivYzSs (2016)
I have started to look down whenever there are these ads around.