​What is this plastic, wall mounted, device with the word “Nosy”, I saw in my local public library?

I’ve tried searching for it but have brought back little. I imagine, given the name, it some type of air purifier, but it looks very advanced. I’ve blurred the QR code in the upper right as I image that’s some asset tag.

These devices were all over my local small branch library. I noticed around 4-5 of them.