because your upstairs neighbor, who knows you're allergic to perfumes, has just used them again in your front hallway, so that you have to go through a flipping gas chamber to get home, and then open a window (when it's below freezing out) and turn on a fan in order to get your apartment aired out enough that you can sleep in it?

I mean, what law is he breaking? Other than the laws of common courtesy.

Bah, humbug!