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Message: <blockquote data-quote="tjoneslo" data-source="post: 1605119" data-attributes="member: 4909">My return question to you is, how much science do you want in your fiction? The key words you want to google on is "Partial Pressure". What determines how breatable the atmosphere is the partial pressure of oxygen. And if the remaining atmosphere is inert enough not to affect the humans breathing it. For example, the partial pressure of oxygen in our atmosphere is (1 atm * 0.20 oxygen) = 0.20. So on a world with three atmospheres of pressure, the percentage of oxygen need to be about 6% or so. If the partial pressure of oxygen exeeds 0.3 or so, it will allow almost anyting (including wet wood and flesh) to burn. Conversly, free oxygen does not exist in an atmosphere without a planetary ecosystem to replace it.As stated above, oxygen is about 5%, which makes it breathable to humans, without too much difficulty. Dust will be a problem, so non-natives may want a filter mask. Tinting air color is difficult. So either don't bother, or don't bother to explan how. The reason is that chemicals that might tint an atmosphere one color or another would be sufficiently concentrated to cause very bad effects on the people breathing them. As others have suggested, post your questions to the <a href="http://www.travellerrpg.com/cgi-bin/Trav/CotI/Discuss/ultimatebb.cgi" target="_blank">Citizens of the Imperium</a> boards for better answers.</blockquote>