I would love to have some better tools in this day and age - specifically, I'd love to have devices that could offer real-time airborne monitoring for pathogens. I'd like two versions: a room air monitor for constant surveillance -- like in an ER or a classroom. Second, I'd like something that operated as a kind of breathalyzer, so you could for example invite people over to dinner with your grandmother, and test them all at the door to protect her. Something easier, less invasive, and more accurate than current home tests, especially when it comes to presymptomatic / asymptomatic cases.

Every few months I see a paper about this sort of thing or a startup, but then it seems to go nowhere.

Does anyone know of people or groups working in this space? I'd be happy to be beta tester. I'm immune-compromised and the lack of progress in technical solutions to airborne infection control after 5 years is a major bummer.