Allergen immunotherapy, commonly known as allergy shots or sublingual immunotherapy, is a treatment approach that aims to desensitize the immune system to specific allergens. It involves regular administration of small doses of allergens over time, gradually building tolerance and reducing allergic reactions. Allergen immunotherapy can be an effective long-term solution for managing allergies and improving quality of life. Remember to consult with medical professionals or specialists for personalized advice and treatment options related to allergies, air pollution, and respiratory health.