I've been in enough to see that there isn't much air movement at all, usually made worse as there is a door to the stall with an undersized louver or no louver at all.

It may be a code requirement now, but I've seen a lot of places where it either isn't working or isn't there.

You want to shit on the street?

I've found the quality of stalls in the USA is far better than Europe in public places, especially when it comes to smell and moisture.