IO540
I flew s coast to yorkshire yesterday and back and my air filter looks exactly the same now as before - absolutely spotless. Unlimited vis at 5000-6000ft, most of the time.
Maybe today is different, and maybe there is more high up.
But I cannot see the physics supporting dangerous (abrasive) concentrations of anything
and 30nm+ horizontal vis.
Towards the end of the day and overnight, suspended particulate matter can descend especially if there is little or no wind. I am not far from Bagby and my car is again covered the same as my neighbors. So I think that is anyone believes that a good sunny day with clear skies means its ok then they are clearly wrong. It's the stuff you cannot see that will cost you money in the long run.