I’m still pondering the implications of transmission being mainly about air, not touching. What interventions does that suggest? Besides the obvious things (opening windows, HVAC filters etc, masks & goggles), one thing I thought of is … perfume!
We could all encourage everyone to wear perfume / cologne when they leave their home, and if anyone can smell anyone else, then they know you’re not sufficiently well physically-distanced (too close or not enough air circulation).
Assuming this would work, I’m not sure how to get it to take off. Maybe an unusually considerate boss of an could tell their employees to all wear perfume (if they have any), to help ensure that everyone is keeping safe distance from each other, and to identify HVAC gaps? Or I could wear perfume and a hat / T-shirt that says “if you can smell my perfume, you’re too close!” I dunno, just brainstorming :-P