I read in the rules that the breathong mask allows you:
10 movement on ocean or river terrain or movement on toxic planets.
Does 10 movement mean 10 city squares? Or 10 individual movements?
And do you need to replace filter after 10 movement on toxic planets too?
The description makes it seem as if it allows unlimited movement on toxic planets.
Most item descriptions were written long before the way they would actually fuction was considered. They'll be updated so it's clear exactly how they function when the atmosphere effects rules are finalised and the dev team get round to it.