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Primary
Primary humidity deficit happens in the atmosphere and is representative of the difference between the humidity that exists and that there could be. A secondary humidity deficit is the difference between what humidity exists and what amount there needs to be
at body temperature. If you are living in an area where the temperature is 98.6 degrees Fahrenheit and the relative humidity is 100 percent you are going to be quite sweaty and very hot.
Secondary
There is also secondary humidity deficit, which is the deficit of moisture in inspired air. When you breathe in air through the nasal cavity it is then heated to the temperature of your body and the potential for water vapor increases. If there is a humidity deficit in the air this is hard on respiration. Humidity deficit is common in the winter but it can also occur during the summer.
Indoor Factors
Humidity deficit can also be the result of the weather or indoor factors such as air conditioning and heating. A humidity deficit in your home can cause your skin to become dry. Dry air drains the moisture out of the cells in your nasal cavity and nose, and this makes blood vessels get hard and crack, and your nose then bleeds.
Humidifier
Some people opt to humidify their homes, especially during the winter months, because lack of humidity can result in increased levels of bacteria and dust mites in the home as well as fungus spores and molds. A humidity deficit can cause your skin to dry out
so that it cracks and can lead to respiratory irritation and problems.