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The NASA has recently lowered their recommendation for astronauts on the ISS from 7000 ppm to 5300 ppm CO2 NASA has continued to lower CO2 exposure levels for ISS astronauts, down from 5.3 mm Hg (7000 ppm) to “4 mm Hg [under 5300 ppm] more recently.” see https://thinkprogress.org/its-taking-less-co2-than-expected-to-cause-health-risks-in-astronauts-...


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Two recent studies tend to contradict the 2016 study mentioned in Ken Fabian's answer. Acute Exposure to Low-to-Moderate Carbon Dioxide Levels and Submariner Decision Making (June 2018) reports: METHODS: Using a subject-blinded balanced design, 36 submarine-qualified sailors were randomly assigned to receive 1 of 3 CO2 exposure conditions (600, ...


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I don't doubt that CO2 has the potential to impact cognitive abilities and that poor air quality really affects many people. However, if we consider all factors impairing cognitive abilities in a typical office environment, the elephant in the room is the noise. Therefore I believe that the impact of CO2 on cognitive abilities doesn't hit the news because ...


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Even if your concern is interesting the "fact" you bourght up seems surprinsing to me. With ventilation and open windows, it seems strange to me that CO2 level increase that much but still, I'm no expert... So I checked. After a bit of research I found this article which talk about the 15% drop in cognitive function in office with 1000ppm (which Michael ...


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There looks like legitimate cause for further study, preferably by scientists breathing air under 950ppm CO2 (this study showing a 15% decline in cognitive ability at this level). Because it is not known what mechanisms are involved in this decline in cognitive ability it is not clear if there are threshold levels, with step changes in impacts or if the ...


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You are being alarmist. CO2 levels vary considerably from place to place, but as you know, the average level is just over 400 ppm. You have a higher level than that in your own lungs at this moment, so it is far too low to cause mental problems. Places with raised CO2 levels have existed since time immemorial, but were rarely high enough to produce the ...


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A gas is generally considered a greenhouse gas (GHG) if it meets both the following conditions: GHG molecules absorb and emit electromagnetic radiation in the infrared (IR) range. GHG molecules can do this because they have vibrational states that can store energy when absorbing a photon with an IR energy level (~1-1600 meV), especially those with the ...


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A molecular gas is a good infrared absorber if it has several atoms (not just 2, like O2 and N2) or if it is hetero-nuclear (e.g. CO and NO). These type of molecular arrangements allow more infrared energy to be absorbed because there are more vibrational states that are possible. Yes, ammonia fits that description, but it is not long-lived in the ...


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The common factor among Greenhouse gases is that they absorb and scatter infra-red light. The Greenhouse effect is caused when energy coming in from the sun is prevented from escaping again. The Sun emits light primarily in the visible spectrum, with some UV and infra-red, most of which is absorbed by the Earth. This causes the Earth to heat up and in ...


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