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* ''Franchise/{{Halo}}'': the vast majority of species seen all breathe the same oxygen atmosphere humans do. The one exception is the Grunts, who breathe methane and have to walk around with large breathing tanks strapped to their backs. The Flood is said to alter the atmosphere in some way once it grows large enough, though no one seems to have any problems breathing even in heavily infested areas.
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[[folder:Visual Novels]]
* ''VisualNovel/SouthScrimshaw'': Averted for human colonists first coming to Aria. While the lifeforms on the planet [[{{Ultraterrestrials}} descended from Earth life]] and are thus reasonably earthlike in biology, the eons of divergence have resulted in an atmosphere that still requires humans to adjust to breathe comfortably due to the unique microorganisms in the air. New colonists have to spend weeks or even months in a special medical bay where they get treated for constant nausea and get fed locally grown food that will help their gut flora adjust.
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* ''VisualNovel/SouthScrimshaw'': Averted for human colonists first coming to Aria. While the lifeforms on the planet [[{{Ultraterrestrials}} descended from Earth life]] and are thus reasonably earthlike in biology, the eons of divergence have resulted in an atmosphere that still requires humans to adjust to breathe comfortably due to the unique microorganisms in the air. New colonists have to spend weeks or even months in a special medical bay where they get treated for constant nausea and get fed locally grown food that will help their gut flora adjust.
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* Most of the aliens in the ''Film/MenInBlack'' films and [[WesternAnimation/MenInBlack the cartoon]] get along fine without special respirators, although there are exceptions: one species risked premature aging in Earth's atmosphere, while "Atlantis" (actually a [[AncientAstronauts sunken space ship]]) is a posh resort for (salt)water-breathing aliens. When Agent Jay is surprised at the fish-like aliens, Agent Kay {{lampshade|Hanging}}s this with "You think ''all'' aliens breathe oxygen?"
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* Most of the aliens in the ''Film/MenInBlack'' films and [[WesternAnimation/MenInBlack [[WesternAnimation/MenInBlackTheSeries the cartoon]] get along fine without special respirators, although there are exceptions: one species risked premature aging in Earth's atmosphere, while "Atlantis" (actually a [[AncientAstronauts sunken space ship]]) is a posh resort for (salt)water-breathing aliens. When Agent Jay is surprised at the fish-like aliens, Agent Kay {{lampshade|Hanging}}s this with "You think ''all'' aliens breathe oxygen?"
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* Zig-zagged in ''[[VideoGame/{{Minecraft}} Minecraft]]'': Piglins and Hoglins, the native inhabitants of the [[FireAndBrimstoneHell Nether]], will turn into Zombified Piglins and Zoglins respectively after a few seconds of exposure to the overworld, indicating something about the regular world is toxic to them. This, however, does not apply to the player who enters the Nether, any overworld creature that enters the Nether, or any other creature from the Nether that enter the overworld.
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*''Series/Earth2'' had the human characters have no problems breathing the air on G889, although they did have problems with water from local some streams & lakes (usually drinking rainwater instead). Justified in the first episode by their having robotic probe data before they left Earth and characters checking the air before leaving their escape pod after the crash landing.
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* ''{{Series/BabylonFive}}'' zig-zagged this. Four of the five nations that built the station are populated by species who can breathe the same air - humans, Minbari, Centauri, and Narn. Most of the rest of the station's population can too; and nearly all of its volume is filled with an oxygen-nitrogen mix. But there is a section of the station set up with different atmospheres and the Vorlons and a few others are only seen outside of it in enclosed suits. This gets zig-zagged again when we learn that while the humans can't handle the atmosphere in that section without breather masks, some of the other oxygen-breathing aliens can. And it gets zig-zagged one more time when we learn that [[spoiler:the Vorlons can handle oxygen-nitrogen air just fine and only use their encounter suits to hide their nature as glowing EnergyBeings]].
** Babylon Five also had humans walking on the surface of Mars with only breather masks and insulated clothes. This was justified by Mars having been partially terraformed, so that the atmospheric pressure outside was high enough for people to not suffer from the decompression while the air was still not breathable.
** Babylon Five also had humans walking on the surface of Mars with only breather masks and insulated clothes. This was justified by Mars having been partially terraformed, so that the atmospheric pressure outside was high enough for people to not suffer from the decompression while the air was still not breathable.
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* This happens in ''VideoGame/TheDig'', when the protagonists' NASA spacesuits determine the alien planet's atmosphere to be "at least as breathable as the air in L.A." Why suits that were never intended to encounter any atmosphere have such delicate sensors is not explained. Lowe does bring up the issue of alien microbes, but Brink dismisses this with the argument that they would not be evolved to deal with earthlings. Since they later find alien technology that does work on humans, it's possible he was wrong about that, but none of the protagonists get sick.
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* This happens in ''VideoGame/TheDig'', ''VideoGame/{{The Dig|1995}}'', when the protagonists' NASA spacesuits determine the alien planet's atmosphere to be "at least as breathable as the air in L.A." Why suits that were never intended to encounter any atmosphere have such delicate sensors is not explained. Lowe does bring up the issue of alien microbes, but Brink dismisses this with the argument that they would not be evolved to deal with earthlings. Since they later find alien technology that does work on humans, it's possible he was wrong about that, but none of the protagonists get sick.
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-->'''Guy:''' Hey, don't open that! It's an alien planet! Is there AIR? You don't know! ''[[holds his breath]]''\\
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-->'''Guy:''' Hey, don't open that! It's an alien planet! Is there AIR? You don't know! ''[[holds ''[holds his breath]]''\\breath]''\\
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* ''VideoGame/IWasATeenageExocolonist'': A generic piece of text from working in the xenobotany lab mentions that humans being able to breath Vertumna's atmosphere was an unexpected bonus, as the possibility of the planet's life being much more exotic by Earth standards was considered.
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* ''VideoGame/IWasATeenageExocolonist'': A generic piece of text from working in the xenobotany lab mentions that humans being able to breath breathe Vertumna's atmosphere was an unexpected bonus, as the possibility of the planet's life being much more exotic by Earth standards was considered.
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* In ''VideoGame/UnleashTheLight'', Steven and Connie can breathe fine on the alien planets without protective gear, even if they're human (or half-human in Steven's case). One of Pearl's quotes when arriving via Warp Pad {{lampshade|Hanging}}s this:
--> "Steven, you're in luck! There's a breathable atmosphere here this time!"
--> "Steven, you're in luck! There's a breathable atmosphere here this time!"
