Is there a CO2 monitor or Indoor air quality monitor available at the library for loan?
Unfortunately no Helmet library has an air quality monitor for loan at the moment. Although you can find such a tool in the Helmet catalogue, there seems to be no working equipment left now. Hopefully in the future again?
In the Helmet search you can browse all objects and tools for loan at the Helmet libraries, from sport equipment to drill machines, by using * (star) as a search term and then restricting your search to objects only: https://haku.helmet.fi/iii/encore/search/C__S%28*%29%20f%3Aq__Orightresult__U?lang=eng&suite=cobalt