81–90 of 327 posts
Earlier quoted context omitted.
Could you recommend a CO2 monitor? How did you decide to purchase the model that you own?
Awair Glow is a very user friendly/cheap one: https://getawair.com/pages/awair-glow It has an app (and an API) and monitors CO2, humidity, temp, and VOCs. I like it a lot. For me, it mostly serves as a reminder to open the door for a few minutes before bed and let some fresh air in.
Earlier quoted context omitted.
I picked up a CO2 monitor a while ago myself, and the biggest surprise was having it on in the morning in our bedroom with the doors closed. It was easily over 1000ppm IIRC. Ever since then I've made sure to set my AC system to run the "house fan" for 15 minutes or so every hour at night just to circulate the air in the house, and while the numbers went down significantly, anecdotally I swear that I wake up easier in…
Exhaled breath is about 3.8% or 38000ppm so (20000) that's really high! I'm not too surprised since the turnover rate through a few small holes with a relatively large volume is bad. Reducing the facial volume would help a lot as each breath would expel more CO2 as a fractional percentage. It seems that any sort of face covering or even significant exercise could raise your ambient CO2 level well above 1000ppm. I'm a…
Earlier quoted context omitted.
800ppm is a fairly typical value for indoor CO2 and not really that shocking. Fun fact: We've known since ~1850[1] that we should probably stay below 1000ppm for indoors, but we based the measure back then on body odor :) (It still bugs me that oddly cognitive impairment starts at the same point a body-odor measure from the 1800s put CO2 levels, and I keep wondering if we're seeing confirmation bias in action) In gen…
Fascinating. If you were a fan of evolutionary origin stories, you could easily imagine that the negative association with body odor is an evolved "canary in the coal mine" mechanism. That is, once you start being irritated by your cave-mates BO, it's time to step outside for some fresh air (before you are asphyxiated). That said, I doubt humanity spent enough time in caves or other restricted airflow environments fo…
This article about one of the few remaining hunter-gatherer people left, the Hadza, might lead you to question the idea that humans have a "dislike body odor" trait:
> While Hadza have a word for body odor, the men tell me that they prefer their women not to bathe—the longer they go between baths, they say, the more attractive they are. Nduku, my Hadza language teacher, said she sometimes waits months between baths, though she can't understand why her husband wants her that way.
https://www.nationalgeographic.com/magazine/2009/12/hadza/
And this despite the theory that hunter-gatherers are probably even better at smelling than we are: https://www.sciencedaily.com/releases/2018/01/180118142744.h...
Earlier quoted context omitted.
I picked up a CO2 monitor a while ago myself, and the biggest surprise was having it on in the morning in our bedroom with the doors closed. It was easily over 1000ppm IIRC. Ever since then I've made sure to set my AC system to run the "house fan" for 15 minutes or so every hour at night just to circulate the air in the house, and while the numbers went down significantly, anecdotally I swear that I wake up easier in…
> "house fan" for 15 minutes or so every hour at night just to circulate the air in the house, Depending on your climate, this could significantly raise the humidity in your house. Reason is that moisture from the AC coil are wet after the AC turns off. Typically drips off into the pan until next time AC cycles. If you run the fan you will then evaporate into the air circulating some of the moisture just removed.
Part of my home automation system is humidity sensors as well, and while they do spike over 65% sometimes (probably when we have the windows open), they stay around 55% to 60% for the past 30 days. Since I'm only running that fan cycle at night, when the AC tends not to run or not run as much, I'm guessing that helps mitigate the effects of that.
No. I wrote up the computations explaining why. See http://www.moderndescartes.com/essays/co2_closed_rooms/
Earlier quoted context omitted.
> "house fan" for 15 minutes or so every hour at night just to circulate the air in the house, Depending on your climate, this could significantly raise the humidity in your house. Reason is that moisture from the AC coil are wet after the AC turns off. Typically drips off into the pan until next time AC cycles. If you run the fan you will then evaporate into the air circulating some of the moisture just removed.
I live in florida, so I'm well accustomed to the humidity! But thanks for the tip, I actually hadn't thought about that. Part of my home automation system is humidity sensors as well, and while they do spike over 65% sometimes (probably when we have the windows open), they stay around 55% to 60% for the past 30 days. Since I'm only running that fan cycle at night, when the AC tends not to run or not run as much, I'm…
Healthy Workers is a Amsterdam-based startup that measures thing such as: air quality, CO2 and consented employee data (e.g. their sleep and focus) and makes an analysis what parts of the building have an unconductive work environment and how this can be improved.
Conference rooms with bad air are the first problem they look at.
They are hiring for a head of sales and a product designer: https://healthyworkers.recruitee.com/
I own a CO2 monitor and it is shocking how high it can get in a house with two people just existing. 800 ppm or more. Outside air is 410. In a car with air on recirculate, it was getting to >1220 ppm, a level that impairs decision making and lowers brain function. I try to drive with air on fresh from now on. I don’t doubt the air in our conference room with 20 people gets super high in CO2 as the meeting goes on, an…
I can't imagine how it is in any "van dweller" or "tiny house" place.
If you drive motorcycle, you can get 10 000ppm in your helmet, that is close to being out of mind.
Earlier quoted context omitted.
I got this model several months back and have been really happy with it: https://smile.amazon.com/gp/product/B01FYWU2IS/ I got it to monitor CO2 levels in a house without central air. It's pretty amazing how quickly it rises without the air on or a window open. If the air in a room feels "stuffy", it's probably over 1000 ppm.
Yep, that's the one I have. It's fantastic.
Earlier quoted context omitted.
Fascinating. If you were a fan of evolutionary origin stories, you could easily imagine that the negative association with body odor is an evolved "canary in the coal mine" mechanism. That is, once you start being irritated by your cave-mates BO, it's time to step outside for some fresh air (before you are asphyxiated). That said, I doubt humanity spent enough time in caves or other restricted airflow environments fo…
Additionally, to support the idea that we evolved to detect and dislike body odor, you'd have to make sure that humans even have this trait. Too many evolutionary just-so stories generate hypotheses from limited cultural observations. This article about one of the few remaining hunter-gatherer people left, the Hadza, might lead you to question the idea that humans have a "dislike body odor" trait: > While Hadza have…
The idea of ‘cave man’ is sampling bias because natural caves preserve ancient artifacts which tend to disappear in the open.