Possible a must for all bigger offices and supermarkets/kenyonsetc this wimter.
Kenyons? To many “perfumes” will probably falsify results[see video]

Awair Element Indoor https://www.amazon.com/Awair-Element-Indoor-Quality-Monitor/dp/B09NF6JCBM/ref=sr_1_3?crid=2UKCSXIKPFGTR&keywords=awair+element&qid=1692348099&sprefix=awair+element%2Caps%2C196&sr=8-3