Indoor mould is often found in basements, bathrooms, or wherever humidity is high. It is important to note that in tightly insulated homes it is necessary to allow circulation of air for proper ventilation and humidity levels. You can measure humidity with an instrument called a hygrometer which is available at most hardware stores. If you are using a humidifier in winter, be sure to clean it well and often. They tend to gravitate to pillows, mattresses, and carpets.
Mites feed on dead skin but their faeces are highly allergenic.
It is important to vacuum carpets frequently or preferably get rid of them if you are dust mite sensitive. Washing decreases antigen 20 fold. Mite proof encasings for mattresses and pillows inhibit mite proliferation. Indoor pets are responsible for many cases of asthma and rhinitis, not only in children but also in adults. They should never be permitted in bedrooms Treatment of respiratory allergies such as hay fever and asthma involves avoidance of allergens whenever possible.