A moisture level above 40 percent creates the perfect breeding environment for dust mites, which are often a main cause of home-based allergies. Furthermore, excess moisture can promote the growth of mold, another major problem for allergy sufferers. Tape a piece of muslin or cheesecloth to the inside of heating vents to filter out additional allergens. Keep the door and the heating vent closed to the room of an allergy sufferer, though this can mean that the room will not be as warm. Keeping animals out can also relieve allergy symptoms.
Place covers on pillows and mattresses to keep dust mites out and to make for easier cleaning.
Fewer knick knacks means fewer surfaces to collect dust. Outdoor activities Raking leaves in the fall can stir up molds and cause an allergic reaction for some people. After leaves fall to the ground in autumn, they often become a great spot for mold to grow. People that have an allergy to these types of mold can find ordinary fall chores such as raking leaves, composting, planting bulbs or putting in perennials to be a problem. Exercising in the cold air can also be a problem for those suffering from asthma and can even cause Exercise Induced Asthma.