Many people with allergies stay indoors when outdoor air is full of pollen and spores. But dust mites, animal dander and even cockroaches can cause problems indoors. Eight out of 10 people in the United States are exposed to house dust mites, and six out of 10 are exposed to cat or dog dander. Cockroaches cause allergic reactions among people who live in the inner cities or southern parts of the United States. Controlling the air quality in your home, office and car can reduce allergy and asthma symptoms.
Allergens are substances that cause allergic reactions and trigger asthma symptoms in some people.
Allergen particles are carried in the air, but they will settle onto furniture and floor surfaces. The larger the particles, the faster they will settle out of the air. Pollen, dust mite and cockroach debris are larger and settle out of the air more quickly than molds or animal allergens. With aggressive cleaning, you can improve indoor air quality and reduce allergy symptoms. First you need to remove the source of as many allergens that you are sensitive to as possible.