It's very likely pollen from pine trees, said Craig Freeman, botanist and associate curator of the Kansas Museum of Natural History.
There are two kinds of pine cones on the trees, he said. ``There are some that produce the seeds and others that produce the pollen. It's the smaller, papery cones toward the tips of the branches that produce the pollen.
``There's really not much you can do about it. It's easy to get rid of by washing down surfaces. It's mostly a nuisance. But this is how the plants reproduce,'' Freeman said.