Showering how often--It all depends on the level of acceptability, and
the overall practice(such as your daily showering practice of
Bostonians), although weather does matter a lot. Desert storms
are not a problem in most of Mongolia, unless you meant the sand storms
in spring. They are vicious.
Only noticible polluted place in Mongolia is Ulaanbaatar city(do your
sinuses a favor and do not come to Ulaanbaatar at winter
time). Summer is a blast though, w00t!!!
Yes, I DO NOT shower daily. I DO NOT smell bad either. Unless you wanna take a sniff of my feet point blank
.