It's healthy apparently. I've been to a health resort in Ciechocinek where they have huge wooden construction through which they flow salted water so it evaporates and makes the air better for people there.
It's called "tężnia", have no idea how to translate that :) Google gives "graduation tower" but I doubt it's correct.
The question was more about whether the measurement tool provides useful feedback in case of "salty" air. Filtering is a lot of work, and might not be necessary.
