When you move your screen, walk , or something like that, if you look very closely , there are like, 1x1 pixel or 4x4 pixels ( idk ) black particles everywhere, i could only notice it on snow, idk if it only happens on snow or if it is only noticeable on snow, since it is pure white.

I posted some images... but you will have to zoom it a lot and pay attention, very closely !!!

Obs: After i zoomed it , i found out that it is really 1x1 pixels, so you must zoom it and pay attention!

edit: I recommend you to download the image to zoom it or else it is almost impossible to notice