High concentrations of dust mite allergens are a significant risk factor for the development of allergies. They related diseases such as asthma and rhinitis (hay fever). Eighty percent of children and young adults with asthma are sensitive to dust mites. Studies at the National Institute of Environmental Health Sciences (NIEHS) suggest that more than 90 percent of homes in Malta or Gozo have bedding with dust mite concentrations that exceed a level equated with allergic sensitization. This means that Malta and Gozo is are at risk of currently experiencing an asthma and allergies epidemic.
You can also find dust mites in dust ruffles and bed curtains (because they trap dust easily) and on feathers, furs, protein-based textiles, and other organic fibers.
Dust mites are microscopic creatures (smaller than 1⁄70 of an inch) that thrive in warm, dark, moist places—temperatures of 68° to 84°F and humidity levels at 75 to 80 percent. They thrive in bedding because that is where they find their biggest meals: They thrive on sloughed-off human and animal skin.
Under the microscope, dust mites appear as sightless, spider-like arachnids. They breathe through their skin, and while in dormancy, they are impervious to poisons, so insecticides are worthless even if you choose to use them.
Polyester bedding is also a well-known haven for dust mites because it traps moisture from perspiration.
Living in Malta, we face a massive challenge to rid our homes of dust mites because of the high humidity levels that Dust Mites thrive in. I would recommend only to use a Professional Cleaning Service in Malta or Gozo which can safely remove the dust mites as trying to remove them at home can make the problem worse.