Ikea makes a reasonably priced CO2 and 2.5 micrometer particle air quality monitor. https://www.ikea.com/global/en/newsroom/retail/the-new-smart...

ALPSTUGA

My house stays around 800-1000ppm CO2 all the time The HVAC is poorly designed in my opinion.

You might be interested in this: https://youtu.be/ib-D1EelH4Y

It's about a company (https://neoplants.com/ ) which genetically enhances plants and soil with a product you can buy to make them much more efficient at filtering the air. It apparently does work rather than being a placebo.

I measured my office too, with an Adafruit SCD-30 sensor, it also got to 1500ppm faster than I expected. And it took a long time (12+ minutes with fully open windows) to get it down to an acceptable level again. Certainly compelled me to do that more often.

Surprisingly, i couldn't find any calculator or theoretical approach for estimating this (given room of a certain size, how long does gas need to equilibriate with outside atmospheric composition to within some tolerance, through a hole of certain size)

My issue is that, during winters, the bedroom's CO2 raises to the 2000ppm levels. But I keep all doors open in this (small) apartment and not much changed. It's too cold to keep windows open like we do in the summer and it's nighttime so plants won't help.

Interesting, i would not expect this at all tbh.

I open the window.

Any chance you can share a picture of the size of your room and amount of plants and type of plants?

I have a co2 device which gets red and this triggers the window opening for me asap

Interesting. What hardware do you use to measure this?

I have a Netatmo home device that measures PPM and have been observing the trend lines throughout the day. At some points my flat gets up to about 1400, which the device says is bad, and sometimes it goes down as low as 500. I've noticed a pattern but can't quite connect that pattern to my activity or the surroundings. It starts going up around 4pm, which could be homewards-bound vehicles, but it seems to trend even on weekends when there is lower traffic. Maybe I start breathing differently at these times. I'm quite interested in getting to the bottom of it. Unfortunately I'm west facing so plant use is quite limited.

What is the atmospheric ambient CO2 level? Is that variable based on location?

I've learnt a few things:

- I had my sensor on my work desk which meant the CO2 pooled, and was increased dramatically by my breathing almost directly onto it. Moved the sensor at least 1.5m

- I had the sensor quite low down, where CO2 pools (being heavier), so moved the sensor to eye level

- CO2 seemed to increase when cooking (same room), so while cooking I open the windows and let the warmth flow out of the building

Depending on the measurement method and your method of calibration, I'd assume "slightly below atmospheric" is probably just atmospheric. Funnily enough, more CO2 in the blood can actually increase athletic performance and resilience against it is also helping with that. I just open my windows though from time to time.

Wow, my home office is a small box room with no exterior windows (as it's on the inside of the apartment).

I often feel tired at the end of the day and I'd attributed it to just working quite long hours, but maybe it is related to this.

Opening the window works well for me.

do you have 10 plants per square-meter?

it's unlikely that you can add enough to make a big difference. plants are nice, but people often ascribe far more to them than is really happening - have you improved the ventilation too?

https://www.lung.org/blog/houseplants-dont-clean-air