Mold and dust are the probable culprits here. If your attic is dusty, it's a haven for dust mites, especially if it contains old carpeting, bedding, and upholstered furniture. Old toys and tires may have latex, which can cause various skin problems, irritate the eyes and nose, and trigger asthma attacks.
Asbestos can be in ceiling tiles and flooring in older homes.
Stuffed animals are a haven for dust mites, while some plastic and rubber toys can trigger contact dermatitis and other skin problems. Bedding should be encased in plastic to prevent mite problems, and wash blankets at least once a week. Clean and vacuum frequently to prevent dust mites in upholstered furniture, curtains, rugs and even undusted picture frames. Wash window moldings with warm soapy water, especially during the summer, to prevent mold from growing. Keep humidity below 45 percent with a dehumidifier to prevent dust mite and mold allergies.