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I didn't test it back then, it was only much later I made the connection when I started getting the same headaches from university, where I got proper sleep, enjoyed the coursework etc.

A co2 monitor confirmed my suspicion. The problem with co2 monitors, is that it's really impractical to pull one out to check. I'm actually in the process of building one myself that instead sends descrete notifications to my phone if the co2 ppm gets too high.

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How did you end up getting permission to test this? It's hard to believe some high school would allow a random alum to invade their school and leave devices (that could literally be anything. Hell, maybe it's a time-release mustard gas distribution system or [even worse!] recording devices meant to fabricate and embroil the school in some kind of scandal!) in classrooms all over their campus.

I see I didn't articulate myself clearly.

I later confirmed it, by carrying a co2 monitor with me and noticing every time I get that type of headache, it's because the co2 was too high.

The device I'm building will be attacked to my backpack and connected to my phone via bluetooth so it can push notifications descretely, allowing me to get out of a place where the co2 levels will give me a headache, without the social cost of taking out a co2 monitor everywhere you go.

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