The most direct way to determine air humidity in the environment is to use a hygrometer.The appropriate relative humidity for people is 45% ~ 60%RH, depending on the hygrometer to compare the normal humidity level.
Usually the humidity is more than 60%, the humidity of the environment is relatively high.Of course, in production, the humidity requirements of different industries are not the same, and the definition of the range of high humidity is not the same, so the determination of humidity, hygrometer is more accurate.

If you're in the environment and your skin feels moist, then the humidity level may be higher than it should be.
Odors, especially musty odors, are aggravated by high humidity.If the environment smells bad, especially musty, it could be a damp place.A musty smell can indicate a variety of different problems, including mold growth and possibly even decay.
High humidity has a higher chance of being equal to dust mites, while low humidity has a lower chance of being equal to dust mites.It is reasonable to conclude that humidity may be too high if dust mite allergies are encountered in the environment.