481–490 of 499 posts
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Sure. It just draws attention to the fact that a throwaway piece of advice for checking calibration of a CO2 sensor is ‘it should read 400-450ppm outside’ when a few short decades ago that advice would have been ‘it should read 300-350ppm outside’. It’s like if someone said ‘you can check if your chatbot’s news feed is complete and up to date by asking it for ‘recent mass shootings’. There should be two or three in t…
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Cars have a "make the air bad" button, the recirculation button. Some people always have it on. I wonder if it's a factor in road rage.
Sounds like you need to change your cabin filter.
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Thread is significantly better. Zigbee relied on proprietary hubs and apps or hacky work arounds. Matter over thread devices don't need a brand specific hub or app. You can literally control the new ikea products direct from a modern iphone which includes a thread radio, no hub, server or app required. If you already own the ikea hub, they secretly put thread radio in it which was just sitting unused in preparation f…
It's complicated. Matter over Thread is indeed nice in that it you only need generic Thread and Matter servers. It also makes it easier to share credentials between ecosystems. Thread itself is also a pretty nice standard technically. There are also strong downsides though, one is privacy and future cloud lock-in. Zigbee is fully local. Previous Thread standards added the option for NAT64 so that Thread devices can a…
But I'm certainly not about to let simple IoT devices have any internet access at all. Being unable to block this on the TBR as you suggested would be mandatory for me, and not possible on AppleTV.
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You would not notice a difference if you weren’t checking the CO2 ppm. You primed your brain to ‘feel’ the effects of higher CO2 by reading a study and are experiencing the nocebo effect. If it makes you feel better I don’t see a problem with it.
Indoor CO2 is likely overrated here at these sub-1000 levels but it's a useful proxy metric for bioeffluent VOCs which are a tiring subset of total VOCs. Ventilation lowers both. This explains the observation better than nocebo theory. See https://www.aivc.org/resource/effects-carbon-dioxide-and-wit...
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Your comment is suspiciously missing the part where your students performed measurably better after decreasing CO2 concentration.
Assuming they had any control over the ventilation in the room.
Having CO2 sensors is mostly useless. In Quebec province in Canada, they added CO2 sensors in all the classes in all the schools after covid. Now what? Having data does not change anything if nothing is done. If instead all the millions invested would have gone into adding air exchangers, now that would actually do something. And that is assuming that CO2 levels really have an impact. From the last time I researched…
You cannot solve a problem when you don't know you have a problem.
That article's message is spot on. If your CO2 levels are that high then you should fix the HVAC system and get it up to code or lobby for fixing the code. In many countries, a full air exchange in any office space every X hours is mandatory. In other countries that's optional and they need to get their act together.
In most of the world outside of the US, having "an HVAC system" is extremely rare.
I visit a friend in Sweden the other day. Her house was built in the 80s, nothing fancy, a simple one family house. There is a ventilation system integrated. Every room has an inlet and the air is sucked out of the bathrooms and kitchen. Even has a heat exchanger. It's a pretty simple system: no cooling and it's not really used for heating except for pre-heating the incoming outside air with the energy in the exhaust air. But it exchanges the houses air multiple times a day. She told me this has been standard there for decades. A few ventilation pipes integrated into the houses construction and that's it. It's even mandatory in multi tenant houses to check air flow every few years.
It's not just the AC crazy US where HVAC is standard. It's just common sense to have such a system if you care about your health.
I really wish a Apple or another major OEM would integrate CO2 monitor into watches or smartphones. Suddenly, everybody would be aware of the CO2 level in the room, get alerts, etc. and the problem will just solve itself. There are so many rooms, classrooms, movie theaters and other places with poor ventilation where you just feel dizzy, or fall asleep, not knowing it was just due to lower oxygen levels in your blood…
Apple watches already have a blood-oxygen sensor so it's covered, albeit indirectly.
> just due to lower oxygen levels in your blood
So my comment is in response to that.
PS. The downvote button isn't a disagree button. (Although how you can disagree with the fact that Apple watches have a blood oxygen sensor I don't know).