by Adair Locke, MD. 1  Methylene blue is administered intravenously by anesthesia providers for a variety of clinical uses and may be used with increasing frequency as an intraoperative urologic marker dye due to an indefinite nationwide shortage of indigo carmine.
The Effects of Humidity on the Human Body. As discussed in Home Humidity and Allergies, humidity directly affects the amount of allergens in the indoor environment. In particular, high humidity causes both dust mite populations and mold colonies to grow, thereby greatly increasing allergy sufferers' total allergen load.
Humidity is simply the amount of water vapor in the air. The warmer the air, the more water vapor it can hold, which is why tropical areas tend to feel very humid. Relative humidity is the amount of water vapor the air can hold RELATIVE to how much water vapor that air can hold. It is temperature dependent. As air warms and cools, its relative humidity will fall and rise even though the amount of water vapor does not change.