Npt strictly medical, but well worth knowing:
He soon saw how little we knew about regulating the
temperature and humidity of air. He went to work on
the problem. By 1911, he'd written the science of
psychrometry. It describes air temperature and
humidity.

Well, who is he?

A quick google gives me a synonym of hygrometry: "the study of how the properties of moist air can change as a result of air conditioning processes." It never occurred to me, but I suppose there would have to be a word for it!