Social apartments (市営住宅) troubles with odor

Yes i know its awful to live in such place but anyway – several months ago couple in their elegant 70s moved in apt on first floor (i live on second) and I'm going insane of awful odor that started coming out in bathroom area and lately it even comes from storage under kitchen sink. Now whole entrance smells with cigarette smoke, junk clothes store and something fishy. Turning on “ventilation” in bathroom seems only making it worse and smell becoming more intense and i noticed that it sticks to my clothes and towels even in living room.
How can i solve this? Windows wide open helps only a bit since odor coming persistently and i cannot keep them open whole time with winter upcoming.

by Main-Yu-9072