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I have a CO2 monitor in my home office. 800-1100 ppm are pretty normal readings. If I open a window, I can get it down to ~400 ppm, but I don't notice any dif

I have a CO2 monitor in my home office. 800-1100 ppm are pretty normal readings. If I open a window, I can get it down to ~400 ppm, but I don't notice any difference between the two. I've heard that ~4000 ppm is noticeable and can impair, but it's impossible to get the level that high, even in a closed room with no ventilation.

everdrive 5y ago
1,400 to 2,000 is pretty noticeable to me.
- notJim 5y ago
  What does it feel like? And have you tried to mitigate confirmation bias at all? I'm just curious, bc I work in a small office.
  - everdrive 5y ago
    So, it just feels "stuffy." I suspect that there's not much more to it than that. As far as mitigation, if you don't have the ability to ventilate, there's not much you can do about it. I keep an exhaust fan in the window most of the most, when weather allows it. When it's not in there, if all the windows are fully closed, we can get up to 1,600 ppm in a single room if me and my wife are in it for a long time. (eg, sleeping.) With the exhaust fan, I haven't seen it read over 700 ppm, and seldom that high at all.
drran 5y ago
I cannot work after 900-1000 ppm CO2.
lsllc 5y ago
I also have a CO2 monitor and see similar readings. I try to open the windows each morning before it gets hot outside to get some fresh air. I have noticed sometimes when it gets around 1200, I start to get headaches which are almost always relieved by either opening the windows, or going outside (having the dog sleeping in my office doesn't help either, she definitely helps bump up the CO2 numbers!). The highest I've ever seen it is around 1500.
- lucb1e 5y ago
  Not to be dismissive, but when I hear of an individual reporting symptom X given a meter saying Y, I always wonder whether you read the meter and then focus on whether you feel Y (ok, easy enough to control for by not reading first), read the meter only when you have a headache (perhaps it's above 1200 at other times as well, but ok that's also easy to control for if you care to), or even just get used to the pattern when it's high like in the morning before you open windows, or you can feel when the windows were open (colder/warmer depending on outside temperature). You'd need some completely random CO2 level, not have any way of indirectly knowing the value, then spend time in there and repeat it a few times to say that this is really it. However, I remember ~1000ppm being the level where studies also said that people start to report headaches. It appears to vary from person to person; both of your observations (you at 1200, GP claiming 1100 is no problem for them) are likely correct, but I wouldn't trust either observation. Just google/ddg it if you want to know what can happen at different CO2 levels.
  - lsllc 5y ago
    I got the meter because I was getting headaches here and there. I haven't done a proper study, but anecdotally, if I make sure to open the windows and get some fresh air in the mornings before it gets too hot out, I'm usually ok (and the meter reflects that).
jlintz 5y ago
which one are you using?
jxramos 5y ago
would you mind sharing the model of the monitor? I'm interesting in getting one now.
edrxty 5y ago
Working out indoors I've noticed a pretty drastic correlation in measured splits/watts and CO2 over 1k ppm. I tend to notice it at the 1k mark and it falls off exponentially form there when working out with large numbers of other people in enclosed spaces.

everdrive 5y ago

1,400 to 2,000 is pretty noticeable to me.

notJim 5y ago
What does it feel like? And have you tried to mitigate confirmation bias at all? I'm just curious, bc I work in a small office.
- everdrive 5y ago
  So, it just feels "stuffy." I suspect that there's not much more to it than that. As far as mitigation, if you don't have the ability to ventilate, there's not much you can do about it. I keep an exhaust fan in the window most of the most, when weather allows it. When it's not in there, if all the windows are fully closed, we can get up to 1,600 ppm in a single room if me and my wife are in it for a long time. (eg, sleeping.) With the exhaust fan, I haven't seen it read over 700 ppm, and seldom that high at all.

drran 5y ago

I cannot work after 900-1000 ppm CO2.

lsllc 5y ago

I also have a CO2 monitor and see similar readings. I try to open the windows each morning before it gets hot outside to get some fresh air. I have noticed sometimes when it gets around 1200, I start to get headaches which are almost always relieved by either opening the windows, or going outside (having the dog sleeping in my office doesn't help either, she definitely helps bump up the CO2 numbers!). The highest I've ever seen it is around 1500.

lucb1e 5y ago
Not to be dismissive, but when I hear of an individual reporting symptom X given a meter saying Y, I always wonder whether you read the meter and then focus on whether you feel Y (ok, easy enough to control for by not reading first), read the meter only when you have a headache (perhaps it's above 1200 at other times as well, but ok that's also easy to control for if you care to), or even just get used to the pattern when it's high like in the morning before you open windows, or you can feel when the windows were open (colder/warmer depending on outside temperature). You'd need some completely random CO2 level, not have any way of indirectly knowing the value, then spend time in there and repeat it a few times to say that this is really it. However, I remember ~1000ppm being the level where studies also said that people start to report headaches. It appears to vary from person to person; both of your observations (you at 1200, GP claiming 1100 is no problem for them) are likely correct, but I wouldn't trust either observation. Just google/ddg it if you want to know what can happen at different CO2 levels.
- lsllc 5y ago
  I got the meter because I was getting headaches here and there. I haven't done a proper study, but anecdotally, if I make sure to open the windows and get some fresh air in the mornings before it gets too hot out, I'm usually ok (and the meter reflects that).

jlintz 5y ago

which one are you using?

jxramos 5y ago

would you mind sharing the model of the monitor? I'm interesting in getting one now.

edrxty 5y ago

Working out indoors I've noticed a pretty drastic correlation in measured splits/watts and CO2 over 1k ppm. I tend to notice it at the 1k mark and it falls off exponentially form there when working out with large numbers of other people in enclosed spaces.