Re: Humidity/Air Quality and distance.Mitch,
Please provide hard data to support your personal impressions .....
[not that I've got any data myself of course]
Qualitatively (not quantitatively), the effects of temperature, humidity and altitude on air density and thus on ball flight are analogous, and so it would be very hard to reconcile opposing effects between any two as you seem to be suggesting. IOW, what is true for temperature would be expected to be true, mutas mutandis, for humidity as well.
Most golfers who've been at it for a few years (and have even travelled far from their home track) have experienced a wide range of weather conditions, vis. hot, cold, dry, humid, windy, calm, etc etc. Admittedly some have more experience of searing, clammy conditions than others ......
Good grief, I spend time on this forum in part to escape threads like this in a certain excellent GA (general aviation) forum. Now I'm just waiting for someone to post a scenario like, "what if I were standing in the tee box on a conveyor belt that was travelling sideways at 50 knots (I mean m.p.h.) relative to the fairway, and the leading edge of a microburst hit me just as I was starting my down stroke .....".