Tuesday I came home and my apartment smelled like smoke. No not from

[raccoon]

a fire, from a neighbor's apartment.

Most of the time, I'm not bothered with it. It seems to happen when the
neighbor is running the air conditioning and I'm NOT running it. I have noticed it
when the weather is just starting to get warm.

Anybody here knowledgable about that kind of stuff?

[LunaSea]

1. Well,

Can you distinguish the type of smoke from the odor?
Is it:
Wood smoke?
Electrical?
Tobacco?

How familiar are you with how air flows through your apt.?
Could be an outside source coming in.

If your neighbors AC has a serious problem, it won't be long before the unit dies.
I assume it is a heatpump and not a window unit.

Sounds like a call to maintenance is in order.