Manage your allergy symptoms year-round with expert advice from board-certified allergist and immunologist Dr. Gillian Shepherd. What's in the air? Pollen, mold spores, dust mites, and pet allergens affect and irritate more than 60 million Americans. That number is increasing every day-and allergies are now the sixth leading cause of chronic illness. But most people don't know a great deal about these airborne allergens-other than how...