[voxlax]

You can get the same measurements and even more from AirGradient. Those are a bit cheaper and much more solid devices. Not so focused on design, but rather on accuracy: https://www.airgradient.com

I´m not affiliated with them in any way, but I´m using their indoor and outdoor sensors since a few years by now, and I am very satisifed. Btw. their HW is opensource and you can choose between their SW or can flash anything else. The measurement data of my outdoor sensor is publicly available: https://explore.openaq.org/?location=2070168#13.21/48.22244/...

[technotarek]

A sincere question : In a home environment, what information do devices like this provide that you regularly act upon and how? Can you give some examples? I’m trying to understand the use case given I already have a thermostat with humidity readings and look at the weather for air quality. Is it more than after cooking, the PPMs are high, open the window or turn on the vent fan (which I do out of habit anyways)?

I self imposed a rule when I went through the process of having a child — to avoid (negative) information that I couldn’t or wouldn’t really act upon (e.g. learning about genetic markers/hints that couldn’t be prevented and wouldn’t make me think about extreme measures, such as blindness). For me it’s an issue of anxiety management.

[Modified3019]

I mostly use mine just for monitoring humidity (I use a humidifier, but don’t want the humidity going up past 60% or bad things can start to grow) and CO2 which I try to keep below 800-ish PPM by keeping the window slightly open (except during pollen season, which is now)

There was an initial effort of doing things and seeing the effects and eventually finding a nice equilibrium. I now have a feel for what’s needed and it’s not something I put any thought into. I basically check it when the seasons change. Rather than contributing to anxiety, I am now relieved of unknowns.

I’m quite allergic to pollen, and very sensitive to things like smoke, so I’ve already someone more focused on managing my environment than a normal person. A wick based humidifier (don’t use ultrasonic, those breed bacteria and launch them into the air) and large air filter with a big but quiet fan are the most important things in my room. Yes, even the bed.

These devices can also be a good way to catch localized air pollution that exceeds safety limits, though where I live that’s not an issue. Citizens capable of checking air and water quality is a positive in my opinion.

[dylan604]

>I use a humidifier, but don’t want the humidity going up past 60%

out of curiosity, what part of the globe do you live (or when was your home built) that you need a humidifier? I have a dehumidifier as it is quite often > 50% humidity in my home, easily as much as 65%, but that's due to the high humidity outside where it can easily be 85%. Just looked at my sensor, it is currently 81% outside and 55% inside. That 55% is where it really starts to become uncomfortable. I struggle to keep it <50% inside. At these indoor humidity levels, it limits some of the things that I can do indoors as it has a negative affect on things I make/do. So adding humidity is just one of those things that makes me tilt my head sideways and go huh? like a dog because it is so out of my experience.

[Modified3019]

The Pacific Northwest, where today’s humidity is 70%.

However that’s basically irrelevant because the place I rent has a 20+ year old central heating and cooling system, so inside the humidity can drop below 40% and I’ll get painfully dry sinuses and nose bleeds.

55-60% is my own comfort zone

[rolfus]

In cold climates the humidity can drop to uncomfortable levels during the winter (sub 30% where I live). Especially when combined with wood fired stoves.

[joker99]

Not the OP, but my airgradients are part of my home assistant setup. They measure the temperature and humidity, and the values are used for controlling the radiators and the humidifiers. Whenever the co2 or ppm count is too high, I flash some leds red to remind whoever is in the room to open a window - which is extremely important because a lot of people don’t have a natural reflex for getting fresh air. This is especially important when we have guests over, in our small living room, the air goes bad fast.

I was able to improve my sleep because I found out that my waking up in the night was correlated with high co2 values. Same thing with performance in my home office. It’s a small room and the reminder to open a window while I’m in the flow is just amazing.

But: my airgradient devices were anything but “rock solid“. Constant reboots, hung ESPs, I had to swap out the senseair sensors because apparently they go bad, etc.

[kiliankoe]

> I was able to improve my sleep because I found out that my waking up in the night was correlated with high co2 values.

What did you change? I assume it's non-trivial to automatically open windows based on sensor data? Or do you mean you've been able to improve it by knowing about it and opening a window before going to sleep, which now that I write it sounds much more sensible :D

[joker99]

Haha, opening a window automatically was my initial idea, but like you I quickly converged on the latter! In addition, I just keep the bedroom door open as well, which helps a little bit too

[m4r1k]

I'm also an AirGradient user. AirGradient prioritizes accuracy and it's fully OSS. The sensors are fully replaceable; not if but when they eventually lose accuracy. I'd argue that monitoring PM2.5 levels indoors is even more crucial than outdoors. In our home, we have good air recirculation and HEPA filters in every room. Since we began keeping indoor air clean, our spring allergies (and general allergy issues throughout the year) have become much less severe. IMO AirGradient is the best way verify current levels and ultimately ensure the filtration works. https://imgur.com/a/UIkkANL

[technotarek]

Not a fan of my own medical example there. If I knew my kid was going to be blind, there are lots of actions I would take: Educating myself, potentially preparing the home environment etc.

[jvanderbot]

During wildfire season (which was never a thing for most the USA, but now is thanks to Canadian wildfires and climate change), it's really helpful to get instant particle counts indoors and outdoors. Indoors, you can mitigate with "circulation" mode on your hvac system (to filter through the furnace fitler), or by running air purifiers. Outdoors you can just avoid exposure by coming inside / avoiding trips.

[dylan604]

That seems like at strange dig at Canada. Since I was a kid, we’ve known about California wildfires even though I’m not from California. Your comment makes it sound like Americans have never had to deal with wildfire smoke pollution until Canada caught fire. That’s just not true

[jvanderbot]

"Thanks to" was never meant to be a dig! It's certainly not their fault that their forests are drying out, probably from climate change. Wildfires are a tough ecological management problem.

But yes, the upper midwest and east coast essentially never have had to deal with wildfire smoke like we have now. It's as bad as when I lived in LA, but there we expected it. People in Minnesota, for example, are totally unaccustomed to woodsmog for days on end. The current air quality is very unhealthy - also unheard of. Particle counts in the 100s ppm!

[voxlax]

I´m living in the middle of a city, and PM2.5 levels get very high at times. We are way above the yearly 5ug/m3 recommendation. So I just bought a lot of air purifiers (just HEPA, everything else commercially available is useless) and they get switched on if the levels get high (via HomeAssistant). I have a device in the garden and another inside, so I am monitoring the difference on a regular basis. I optimize (manually, no fancy data crunching) for low noise produced by the filters and low <2-3ug/m3 PM2.5 values indoors. I don´t have forced ventilation, so I need to know how much do I open the windows to get humidity and VOCs down, while not letting in too much smog. Sounds more complicated than it really is.

[ajolly]

If you want quiet, look into a diy computer fan based corsirosenthal box. Also ends up being far cheaper

[markasoftware]

If you live in a part of the country where wildfire smoke is common, you can use a PM2.5 sensor (which airgradient has -- and air lab does not) to determine if you're effectively keeping the smoke out of your home and can help you determine whether or not to eg use air purifiers.

[strogonoff]

Among the probably most important and universally relevant measurements offered by air quality monitors is carbon dioxide/monoxide. Humans are not really built for realising when these are elevated, other than feeling sleepy and generally experiencing reduced mental capacity, which by its self-referential nature is not conducive to understanding that you are experiencing reduced mental capacity or being motivated to take measures about it (such as opening windows).

These are all of the ways in which air monitoring information is actionable for me:

— Excessive carbon dioxide: as mentioned, it’s a call to open windows and possibly doors, depending on wind direction and window/door configuration in the flat and the building. It can reach surprising, and in my case unsafe by at least one country’s standards, levels overnight if your flat has decent insulation and little airflow. Besides, it just feels nice to have more oxygen knocking about your internals.

— Excessive (which should really mean non-zero, but in today’s ecology let’s say “elevated”) PM2.5 means I should close windows (usually this pollution comes from outside) and ramp up air filtering, and potentially postpone exercise while particulate matter is too high. I have a separate cheap air filter but lately it turned out that a Mitsubishi dehumidifier does a great job at this—which, by the way, I have realized only thanks to an air monitor.

— If both carbon dioxide and particulate matter are high, I’d most likely open the windows first to lower the former then close the windows and run air filtering while hanging out at the office or having a walk (potentially with an N95 mask on if it’s really bad outside).

— VOC, which often originate from chemicals used in furniture or flooring, if your monitor measures those, could probably be addressed by adding activated carbon layer to your air filter (and by opening windows). I think they are filtered slowly and this might take months, but my monitor did not measure VOCs so I don’t have first-hand experience. An air quality monitor could help you understand whether you are wrong or right in thinking your new floor made your air full of VOCs when all you can go by otherwise is just a vague chemical smell.

— Elevated background radiation means you should probably just move, usually it is building materials or something not easily removable anyway.

I would say that with these numbers available there is a danger you’d stress over and min/max them. It’s probably better to just use the measurements to understand the patterns and see if something is really out of ordinary or elevated for prolonged periods of time. I did that first (and did not expect to see how quickly carbon dioxide builds up, how quickly everything deteriorates with any cooking, including when done by a neighbour if I open windows and the wind blows the wrong way, the speed with which outside pollution permeates the indoor space, how effective my air filtering is, etc.), now my air monitor is broken and I am not overly concerned until I have to move to a new place.

[RivieraKid]

I have AirGradient but this product seems appealing too. It's smaller, portable, doesn't need external power supply and looks better. I also like how the UI looks, it's clearly designed by someone with a visual / artistic taste, the UX could be improved though.

The big question is accuracy, that's possibly a major advantage of AirGradient.

[256dpi]

Thanks! AirGradient is great! They do a very good job and served as an inspiration to us!

On CO2-Sensor Accuracy: Based on AirGradients own research[1], the SCD41 (which Air Lab uses) and SenseAir S8 (which AirGradient uses), compare well indoors. In outdoor environments, the AirGradients sensor is generally better. As the Air Lab is primarily focused on indoor environments, we chose the smaller SCD41 to fit the portable design. But yes, If you're looking for an outdoor air quality monitor, AirGradient will be more accurate.

[1]: https://www.airgradient.com/blog/co2-sensors-photo-acoustic-...

[RivieraKid]

How about temperature accuracy? AirGradient did a bunch of tests and adjustments to mitigate effects of insufficient air circulation and heat from electronics.

[elif]

Likewise I use uHoo sensors which add carbon monoxide, ozone, and PM2.5 and has a full app with phone alerts etc. I have been only satisfied with the sensors which have great algorithms for handling sensor calibration drift

[jonah]

I'm really surprised more systems don't offer carbon monoxide sensing. To me, it's one that is really important to be aware of.

[esskay]

Another vote for AirGradient's devices which are great IMO, got a few of them now and they've been very easy to integrate into my setup.

[badmorale]

AirGradient is fantastic!