Restarting your entire game can help, as long as you restart while you're in the problematic zone. That is, of course, not always (or often) a realistic response. I encounter the same thing in areas with intense particle effects (mists are fine) - even areas with the green-dripping trees.
I have a 1080, 16 gigs of ram, and a monstrous processor, so it's definitely a game issue. Here's hoping the upcoming update has it fixed.