Well, it’s really the removal of air pollution, caused by high winds, that brought about the change that caught my attention. Where we live, we have only a little smog, but it doesn’t change much because we never have high winds. Many days we have dead calm.
About a month or so ago we had unusually high winds for several days due to a tropical storm. The wind blew out all of the smog, and that’s when I noticed the weird coloring in the sky. Even though we’ve haven’t had much wind during the time that’s passed til now, the weird coloring persists.
So, I think it’s been that way for awhile, but it took the wind change for me to notice it. It’s definitely not like it was a few years ago.
I read a blog post from some guy who claims that the UV mixture getting to the earth’s surface has changed to include much more UV B than before (relative to UV A). That’s a little bit the way it looks to me - like the blue and UV has shifted up.
Hopefully, it’s not my eyes that have changed LOL …