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If anyone is in an indoor environment and wants to gauge risk, a portable co2 meter can be had for about $100-$150. Cod2 is a good proxy for indoor pollutants/a

by graeme 6y ago

If anyone is in an indoor environment and wants to gauge risk, a portable co2 meter can be had for about $100-$150. Cod2 is a good proxy for indoor pollutants/air exchange, and I’m assuming it is a good proxy for aerosols too. I use one of these, you can use a portable battery to power it. https://www.amazon.com/AutoPilot-APCEMDL-Desktop-Data-Storage/dp/B07JDJP4HH/ref=sr_1_15?dchild=1&keywords=Co2+meter+autopilot&qid=1596467296&sr=8-15 https://www.amazon.com/AutoPilot-APCEMDL-Desktop-Data-Storag...

klysm 6y ago
It seems to be an even better proxy for aerosol risk compared to general circulation because co2 is coming from lungs - I might make myself a wearable logger
ketamine__ 6y ago
We're constantly filling the rooms we occupy with aerosols from our mouths. How will this help?
- function_seven 6y ago
  Because we’re also constantly filling rooms with the CO2 that we exhale. The CO2 meter acts as a proxy for how much exhaled “stuff” is lingering about. So if your CO2 meter shows that the room is at ~400ppm [:’(], rather than 800 or 1000, then you can deduce that the room is well ventilated. I’m other words, whatever ventilation removed the excess CO2 most likely also removed the aerosols at the same time.
  - driverdan 6y ago
    Considering atmospheric CO2 levels are around 400ppm you're not going to keep it that low indoors unless it's full of open windows.
    - graeme 6y ago
      Yup. I have all of my windows open right now, it’s summer. Co2 tends to be around 500. Even outdoor city air in my location is more like 450, though of course my meter could be biased high.
    - function_seven 6y ago
      That’s what I was getting at. 400 is the lower bound, if you have many windows open on a breezy day in the country. The tear emoticon was a nod to how high that baseline is.
newsbinator 6y ago
Is there a reliable portable Co2/Pm2.5 logger? I've heard the accuracy on the Pm2.5 ones at least is way off. I just moved to a place where I need to keep an eye on Pm2.5 in particular.
- graeme 6y ago
  It doesn’t log pm2.5. Only co2. For pm 2.5 I recommend a laseregg
graeme 6y ago
Can’t edit: co2 is a good proxy for VOC’s. CO2 is not a good proxy for pm 2.5, to be clear: this depends on the pm 2.5 in your outdoor air. In other words co2 is a proxy for indoor/outdoor air exchange, and thus should be a proxy for how fast aerosols are sent outdoors.

by graeme 6y ago

klysm 6y ago

It seems to be an even better proxy for aerosol risk compared to general circulation because co2 is coming from lungs - I might make myself a wearable logger

ketamine__ 6y ago

We're constantly filling the rooms we occupy with aerosols from our mouths. How will this help?

function_seven 6y ago
Because we’re also constantly filling rooms with the CO2 that we exhale. The CO2 meter acts as a proxy for how much exhaled “stuff” is lingering about. So if your CO2 meter shows that the room is at ~400ppm [:’(], rather than 800 or 1000, then you can deduce that the room is well ventilated. I’m other words, whatever ventilation removed the excess CO2 most likely also removed the aerosols at the same time.
- driverdan 6y ago
  Considering atmospheric CO2 levels are around 400ppm you're not going to keep it that low indoors unless it's full of open windows.
  - graeme 6y ago
    Yup. I have all of my windows open right now, it’s summer. Co2 tends to be around 500. Even outdoor city air in my location is more like 450, though of course my meter could be biased high.
  - function_seven 6y ago
    That’s what I was getting at. 400 is the lower bound, if you have many windows open on a breezy day in the country. The tear emoticon was a nod to how high that baseline is.

newsbinator 6y ago

Is there a reliable portable Co2/Pm2.5 logger? I've heard the accuracy on the Pm2.5 ones at least is way off. I just moved to a place where I need to keep an eye on Pm2.5 in particular.

graeme 6y ago
It doesn’t log pm2.5. Only co2. For pm 2.5 I recommend a laseregg

graeme 6y ago

Can’t edit: co2 is a good proxy for VOC’s. CO2 is not a good proxy for pm 2.5, to be clear: this depends on the pm 2.5 in your outdoor air. In other words co2 is a proxy for indoor/outdoor air exchange, and thus should be a proxy for how fast aerosols are sent outdoors.