There are some hazards to living high up in the Rockies that you don't find out about until you're actually living here.
In the winter, there are the large stinging clouds of swirling snow.
Right now, we are just coming to the end to the large gritty clouds of yellow green pine pollen. ON warm days (>80 F) like today the pine pollen gets ready in the calm morning air.
Then, as the first gust of afternoon wind blow across the hillside, the pollen takes flight, and forms huge yellow green clouds.
These clouds coat everything with a thick, gritty, yellow-green coat. This pollen keeps blowing around until it is finally washed down by a afternoon thunderstorm, like we just had.
We had similar situation last weekend. The whole process was interrupted by a cold snap that we had right after the weekend.
Hopefully, this is the end of pollen season. It takes weeks for the pollen coat to disappear from surfaces.