3 ms·

This is extremely wrong: CO2 impairment kicks in around 1000 ppm[1] possibly lower. You can hit this breathing by yourself in an unventilated 3x3m room (litera

by XorNot 3mo ago

This is extremely wrong: CO2 impairment kicks in around 1000 ppm[1] possibly lower. You can hit this breathing by yourself in an unventilated 3x3m room (literally measured in my house). 1 https://pmc.ncbi.nlm.nih.gov/articles/PMC4892924/ https://pmc.ncbi.nlm.nih.gov/articles/PMC4892924/

spockz 3mo ago
You hit it even easier when driving in a car with the internal circulation turned on to keep nasty fumes out.
- uxhacker 3mo ago
  In a car with Recirculation Mode on Levels routinely spike between 1,500 and 4,000 ppm within 20 to 30 minutes. I wonder how many driving accidents can be saved by having a co2 monitor in the car.
  - eurleif 3mo ago
    I had to drive a rental car for a bit recently, after getting rear-ended, and I was shocked to discover that it defaulted to recirculation mode every time it was turned on, regardless of whether you'd turned it off the previous time. I felt light-headed in it a few times before I realized I needed to manually turn recirculation off every time. Horrible behavior, and I don't doubt that it's responsible for many accidents.
teravor 3mo ago
there is some ambiguity here. submariners are exposed to really high co2 levels and are doing fine. it's possible that regular high co2 is just a proxy for bad air, and that you can acclimate to purely high co2 pretty well. i have felt bad in high co2 environments before but i have never been in a controlled high co2 environment.
- XorNot 3mo ago
  I'm not implying permanent effects. The studies involved show a marginal reduction in cognitive reasoning on standardized tests. Which is the point: if you're in a room trying to do deep work, that's likely a problem. I suspect submarines are all over the place here: you might be exposed to higher levels routinely but you also have regular access to chemical scrubbers and decent ventilation. I'd be fascinated to know what levels are tracked as normal.
  - teravor 3mo ago
    apparently those scrubbers are less efficient the lower the co2 is (also need to move much more air which ruins stealth). iirc submarines are routinely exposed to multiple thousands.
    - XorNot 3mo ago
      It does look like this has been studied: https://pubmed.ncbi.nlm.nih.gov/29789085/ https://pubmed.ncbi.nlm.nih.gov/29789085/ and found no significant effects. So quite possibly an adaptive response?

by XorNot 3mo ago

spockz 3mo ago

You hit it even easier when driving in a car with the internal circulation turned on to keep nasty fumes out.

uxhacker 3mo ago
In a car with Recirculation Mode on Levels routinely spike between 1,500 and 4,000 ppm within 20 to 30 minutes. I wonder how many driving accidents can be saved by having a co2 monitor in the car.
- eurleif 3mo ago
  I had to drive a rental car for a bit recently, after getting rear-ended, and I was shocked to discover that it defaulted to recirculation mode every time it was turned on, regardless of whether you'd turned it off the previous time. I felt light-headed in it a few times before I realized I needed to manually turn recirculation off every time. Horrible behavior, and I don't doubt that it's responsible for many accidents.

teravor 3mo ago

there is some ambiguity here. submariners are exposed to really high co2 levels and are doing fine. it's possible that regular high co2 is just a proxy for bad air, and that you can acclimate to purely high co2 pretty well. i have felt bad in high co2 environments before but i have never been in a controlled high co2 environment.

XorNot 3mo ago
I'm not implying permanent effects. The studies involved show a marginal reduction in cognitive reasoning on standardized tests. Which is the point: if you're in a room trying to do deep work, that's likely a problem. I suspect submarines are all over the place here: you might be exposed to higher levels routinely but you also have regular access to chemical scrubbers and decent ventilation. I'd be fascinated to know what levels are tracked as normal.
- teravor 3mo ago
  apparently those scrubbers are less efficient the lower the co2 is (also need to move much more air which ruins stealth). iirc submarines are routinely exposed to multiple thousands.
  - XorNot 3mo ago
    It does look like this has been studied: https://pubmed.ncbi.nlm.nih.gov/29789085/ https://pubmed.ncbi.nlm.nih.gov/29789085/ and found no significant effects. So quite possibly an adaptive response?