If your neighbour pollutes the hell out of his chunk, quite a bit of it will go your way (depending on wind direction etc.)
And then you sue the shit out of him for damages.
If you know exactly which neighbour it is.
The smoke stack is probably a dead giveaway.
BTW: Another scenario would be something that dissipates very well in small quantities, but the effect is quite bad. Like some sort of poison leaking out.
It could be traced. Just walk toward the higher concentrations.
OR... Some kind of pollution that is hard to detect where it comes from, and most neighbours are polluting small amounts that add up and does damage.
Damage to whom? If most of them are doing it, and suffering damages from it, then they are suffering the damages from their own actions. If you're not doing it, and suffering damages from their actions,
sue 'em.
Or maybe some kind of pollution where it's hard to detect the source unless you are close, but someone far away does a lot of it, and his neighbours does not care or his land plot is large and the sources placed in a way that makes it hard to pinpoint the pollution without being at the private property. Not to mention that the pollutant is a part of unpolluted air, only in far less quantity.
Again, it could be traced. Just walk toward the higher concentrations.