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gwern comments on What is up with carbon dioxide and cognition? An offer - Less Wrong
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It is odd, isn't it? The effect sizes seem ridiculous*, but there's nothing obviously wrong with that study (aside from the sample size). Cochran has blogged about oxygen before as well. To compile some of the relevant papers:
The problem for me is that while it makes sense that since we run on oxygen and the brain uses a lot of oxygen (the whole 'BOLD' thing etc), more oxygen might be better, it has the same issue as Kurzban's blood-glucose/willpower criticism: if the brain needs more oxygen than it's getting, why doesn't one simply breath a little more? While sedentary during these sorts of tasks, you have far more breathing capacity than you should need - you are able to sprint all-out without falling over of asphyxiation, after all. So there's no obvious reason there should be any lack, even more so than for glucose. And shouldn't CO2 levels closely track various aspects of weather? But as far as I know, various attempts to correlate weather and cognitive performance or mood have turned up only tiny effects. In addition, too much oxygen can be bad. So is it too little oxygen or too much nitrogen or too much carbon dioxide...?
What monitor is that? You could try recording CO2 long-term, especially if it's a data logger. Opening windows is something that's easily randomized.
I did some looking and compiling of consumer-oriented devices a while ago: https://forum.quantifiedself.com/t/indoor-air-quality-monitoring-health/799/40 I was not too impressed since nothing hit the sweet spot of accurate CO2 and PPM measurement under $100. The Netatmo looked decent but there are a lot of complaints about accuracy & reliability (checking the most recent Amazon reviews, still a lot of complaints).
I've been thinking maybe I should settle for the Netatmo. I've been working on a structural equation model (SEM) integrating ~100 personal data variables to try to model my productivity (some current sample output), and it would be nice to have even noisy daily C02 variables (as long as I know how noisy and can use it as a latent variable to deal with the measurement error). Correlation-wise, I think backwards causation can be mostly ruled out, and the most obvious confound is weather, which is already in my SEM.
* taken at face value, with reasonable estimates of how much rooms differ from day to day or week to week, CO2 levels would explain a lot or maybe most of variability in IQ tests or cognitive performance!
Some followup links:
Emergency and Continuous Exposure Guidance Levels for Selected Submarine Contaminants, National Research Council (2007), chapter 3 "Carbon Dioxide"; many negative mental and physical effects at extremely high CO2 concentrations >50000PPM; consistent statistically-significant effects below that tend to be harder to find but from the descriptions, they often were not using sensitive tests of higher cognitive functioning, a broad array of different measurements, and very small sample sizes; I suspect a meta-analysis grouping tasks by domain with some correction for ceiling effects might turn in a very different conclusion than their fairly sanguine conclusion that there are no cognitive impairments <40000PPM and <25000PPM is a perfectly safe limit. (Oddly enough, I came across this book on an anti-global-warming site; apparently Satish et al 2012 is really just global warming propaganda scare tactics, because the Navy has proven that CO2 is perfectly safe.) Cited for cognitive effects:
(requested the missing ones)
More:
Sleep oriented studies: