In the picture above, there is a lot of very dirty snow in the upper layers. (dotearth.blogs.nytimes.com)
Before it was really hard to find things for her to do outside since she is still not the most stable walker and I don't want her to eat dirty snow. (pinkandnavystripes.com)
I feel like I would have dirty snow stains on them in 2 seconds after stepping outside. (looplooks.net)