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.