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 partially controls the moisture that's lost from a plant. Plants growing in dry rooms lose moisture, which can harm many plants. Not all houseplants need the same levels of humidity. While desert houseplants such as cacti need about 30 percent humidity, others native to tropical rain forests require much higher humidity levels, as high as 90 percent. Plants needing higher humidity do best when grown in closed containers such as terrariums.