Does wildfire haze get in the way? Can IR or LIDAR or something see through it reasonably well?

If you built your drone on mostly visual data... or visual-centric sensor fusion... imagine trying to deliver in NYC with The Fog. The tradeoff drones make for their airspace is being at an altitude where there's an awful lot of "terrain".

Fortunately it's not like that here but I'm not in an area that's probably dense enough for drone delivery for a bit (except subdivisions/etc).