Timeline for What can I add to an oxygen/nitrogen atmosphere to make it unpalatable or poisonous to humans, yet stable and breathable to local creatures?
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| when toggle format | what | by | license | comment | |
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| Sep 19, 2017 at 18:27 | comment | added | Ash | Gaseous Arsenic compounds are too toxic for the OP's purposes, the least toxic are universally lethal at a few hundred ppm. | |
| Apr 21, 2017 at 21:24 | comment | added | user | Wikipedia seems to claim that 5 mg/m^3 is "immediately dangerous to life and health". Because I'm too lazy to run the exact numbers right now, if the atmosphere is approximated as nitrogen (about 1.251 g/dm^3 = 1251 kg/m^3 at standard temperature and pressure), if my math is right then that's about 4 ppm! Makes me wonder what a few percent (tens of thousands of ppm) would be like for unprotected human visitors; almost certainly immediately debilitating, at least. en.wikipedia.org/wiki/Arsenic#Legal_limits.2C_food.2C_and_drink and en.wikipedia.org/wiki/Nitrogen | |
| Apr 21, 2017 at 9:23 | history | edited | user | CC BY-SA 3.0 |
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| Apr 21, 2017 at 8:20 | history | answered | don-joe | CC BY-SA 3.0 |