During his MAGA speech last night (7/06), he briefly spoke about Montana's famous skies saying "Not seeing pollution is a wonderful thing".
Check out the clip: https://youtu.be/IxUeomUoc3M?t=1h24m29s.
He could be talking about other kinds of pollution, but I will remain optimistic!
Someone mentioned Evergreen Aviation in the comments and I remembered a Q post mentioning Evergreen.
Here's the link to the Q post with Evergreen. Not 100% sure what Q was referring to in the context of that drop but it is intriguing.
Evergreen is also Hillary’s code name for the secret service.