I work in the ground floor of an office. The air conditioning and heating system is linked directly to the street outside. This means that whatever is going on outside comes in to us – we're right next to a main street, so our main problem is with cigarette smoke, but we're also concerned about the amount of traffic fumes coming in, too.
We've complained about it a fair bit, but the landlord says it's our company's problem, while our company argues that the landlord should sort it. Meanwhile, obviously, we're still having to put up with whatever's coming through. Not sure whether there's anyone else we can go to to try and force a resolution to this before somebody gets seriously ill.