This would be very interesting for industrial applications that rely on clean rooms. What comes to mind is environmental monitoring for microbes, which is tedious but important and currently has significant lag time (≈2 weeks).

What I couldn’t determine is whether there is any information about concentration. I mean so what if something is present, you have a lot of ubiquitous organisms out there.

Nevertheless, if the technology matures, it could help identify a problem earlier before it becomes visually obvious. You would still need to determine the root cause. Or it could help with a better decision making before buying a house?

All in all a lot to think about.