They flourish in damp basements, closets, bathrooms, fresh food storage areas, refrigerators, houseplants, air conditioners, humidifiers, garbage pails, mattresses, and upholstered furniture. Like pollen, there must be a large amount of mold spores to spark nasal allergy symptoms. Since mold spores are found almost everywhere, they sometimes outnumber pollen spores in the air. Fortunately, there are only a few dozen types that pose a threat to people with nasal allergies. But if your nasal allergies persist through the winter months, you may be allergic to dust mites.
Dust mites are microscopic organisms that live in upholstered furniture and carpets.
They can thrive in your house all winter long. So if you're allergic to them, you most likely have nasal allergy symptoms throughout the year even when pollen and mold seasons are over. It's a common misconception that people with animal allergies are allergic to animal hair and fur. But really, animal dander, saliva, and urine provoke nasal allergy symptoms in people. Furniture and carpets are great havens for animal dander to settle.