When the driveway runs yellow in the rain, it’s pine pollen season:
Our robot vacuum snuffles up quite a collection of dust:
Peeling a layer of the usual fuzz off the filter reveals the pollen:
This, too, shall pass and my eyes will rejoice.
Pine Pollen Season
The Smell of Molten Projects in the Morning 
Why are you vacuuming the driveway? 😉
An astonishing amount of pollen came from the floor of the interior hallway, with no windows or doors to the outside, a few days after Mary had applied the Real Vacuum to it.
Indeed, she was even biking with an N95 mask for a few days on the leading edge of the season.