Why on the floor of the Russian underground scatter sawdust
If you travel on the metro, you probably have noticed, both on the floor sometimes scatter sawdust. Janitors do it, which then sweep the sawdust, and that's what they do not know everything.
Metro Station - is a closed space, which is always a lot of people. These people bring with a dust and dirt.
In addition - this ubiquitous rusty red dust. If during cleaning simply sweep or apply any technical means such as a vacuum cleaner, then all the dust rise into the air and lands everywhere, including clothing of passengers and their lungs. Wet sawdust scattered on the floor attracts dust and dirt particles, preventing them from up in the air. Themselves as dust quite easily sweep: they gather in clumps and do not stain the marble floor.