Ayurvedic Treatment of Dust Allergy What is Dust Allergy? Dust allergy is the congestion of nose due to inhalation of dust particles. When dust particles laden with dust mites enter your nasal cavity, they cause allergy to your nasal mucosa. It is characterized by persistent sneezing, blocked or stuffy nose, red or watery eyes, itchy throat, coughing, falling of secretions into the throat, facial and nasal congestion.