Allergy is a significant triggering factor in asthma and allergic rhinitis. Inhaled allergens and IgE-mediated allergic reactions play a central role in the pathogenesis of allergic asthma and allergic rhinitis. Allergen avoidance is recommended for the management of allergic asthma and allergic rhinitis by current guidelines. house-dust is the most prevalent sensitizing agent in Singapore. Effective allergen avoidance requires a multifaceted, comprehensive and sustained approach.