Assuming a patient is already taking allergy medications and even undergoing allergy shots , the other component for good allergy symptom control is avoidance. You can certainly add good filters to a home's HVAC system , but what about outside??? What if avoidance is impossible? For example, if you need to cut the grass on your lawn and you have severe grass allergies or if you need to clean out a moldy basement and you have bad mold allergies? That's when wearing a face mask or r…