Indoor allergens, such as pet dander, dust mites, and indoor mold are a major cause of allergy and asthma symptoms. People suffering from indoor allergies are typically exposed to these common indoor contaminants for long periods of time — particularly at night when sleeping. When allergy testing shows the presence of allergies to indoor allergens, avoidance techniques are often tried first to reduce allergy symptoms from developing. This step may include using an air filter or air cleaner inside the home to reduce the amount of indoor airborne allergens that may cause or worsen allergy and asthma symptoms.
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