Ask HN: The coronavirus antigen detection mask?

I thought about this too. My thinking was that it should have a replaceable pad that's the primary collector. I also wondered about a urine based test that changes color if it's positive.

Not theoretically possible, serves no purpose that a test currently doesn't, and even if it was possible, it has no medical purpose.

An N95 mask can easily be $1-$2 per unit at point of sale. Simpler masks cheaper yet. This sounds unaffordable.