Why don't listing agents pay attention to radon testing?

I'm out at an Ann Arbor home inspection again today and we arrived to
find the windows partially open. This is a bit frustrating because
radon tests require the home to be closed up for at least 12 hours
before the radon data is valid.

So, since the seller wasn't asked by the listing to close up the
windows we have to wait an additional 12 hours.

I'd guess that the listing agent doesn't know much about representing
buyers or he would have told the sellers.

Typical.