Here's a fascinating aerosol map:
https://earthobservatory.nasa.gov/images/92654/just-another-day-on-aerosol-earth
Imaged by MODIS - Moderate Resolution Imaging SpectroRadiometer
On the date of writing this is showing the map for 23 August, where the smoke from the Californian forest fires is heading this way.
It's amazing how the clarity of the atmosphere is affected by so many things. These will all have an effect on our imaging.
Mark
Another great site Mark.
Roger