I have that problem right now.
Every November since I've been here, there has been an awful smell in the air, from one or more of the local trees.
It's strong, pungent? acrid? hard to describe, but awful.
It permeates everything, getting into my home even with doors and windows shut. It doesn't seem to bother anyone else, or maybe they just don't complain like I do.
It is so bad, the smell stays in my nose and mouth affecting the taste of almost everything I eat.
At first I thought it was the weeping willow near my front door, I've never seen one as "white" as this and thought maybe it was pollen from the clusters of tiny yellow flowers. Then I wondered if it was the really big cypress next to it. I know there are many types of cypress, but I don't have a clue which is which and I'm not 100% sure this is a cypress at all, but it does look like the pictures I've seen. And there are quite a few of them in this area.
I block off my nose and mouth and breathe through a hanky when I pass close by these trees, but can't spend my whole day doing that and the two trees are so close to my front door. The smell, ( I can't call it fragrance) is like Jasmine, spreads for a fair distance and is stronger at dawn and dusk.
Anyway, I was passing a tall hedge just yesterday, in my street, it appears to be the same cypress, just trimmed to hedge size, and the owner of said hedge was trimming it with a chainsaw/hedge trimmer thingy and there was that smell, so very much stronger, coming from the freshly cut branches and leaves. (needles?)
So now I know which tree is the problem. The cypress, not the willow.
Although that doesn't solve my problem of having that smell as a taste in my mouth.
And now I'm off to buy more antihistamine, since this is making my nose run like a waterfall.