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    I got my A3 t a couple of days ago and because I work in an office full of geeks (we make embedded systems) they demanded that I immediately open it up. Then, having established that the box was indeed full of expensive sensors, we had to plug it in and see it working. So the whole office has been watching the graphs and discussing what it all means. Finally I managed to take it home, … and now they’re watching the graphs from home.

    CO2 Graph from my office

    The disturbing thing is the CO2 level inside the office. It peaks over 1200ppm and only drops to 800 overnight. When I took the unit home it says 350mm there, so it’s something about the air in the building at work. We have suspect that it’s bad, now we have numbers.


    250-350ppm Normal background concentration in outdoor ambient air
    350-1,000ppm Concentrations typical of occupied indoor spaces with good air exchange
    1,000-2,000ppm Complaints of drowsiness and poor air. (this is us)
    2,000-5,000 ppm Headaches, sleepiness and stagnant, stale, stuffy air. Poor concentration, loss of attention, increased heart rate and slight nausea may also be present.
    5,000 Workplace exposure limit (as 8-hour TWA) in most jurisdictions.
    >40,000 ppm Exposure may lead to serious oxygen deprivation resulting in permanent brain damage, coma, even death.


    Thanks for the “hands-on” data . I can confirm CO2 is bad, especially when you need to do sensitive work as it’s getting harder to concentrate.

    Flag changed to the right one.

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