Pollen grains are the small male reproductive bodies of plants that fertilize female flowers. You can lower your exposure to pollen by keeping the windows in your home and car closed during high-pollen seasons especially on windy days. When you come home at night, wash or wipe down your hair with a damp cloth to avoid inhaling pollen while you sleep. Frequently, pollen counts will be reported on the weather channel, the local radio station or in your local newspaper.
Animals shed small scales called dander from their hair, fur or feathers.
Animal dander often stays in carpets and mattresses for an extended period of time. Try to keep your pets outdoors or, at the very least, out of your bedroom. Bathe them weekly, if possible. Dust mites are tiny transparent creatures that feed on human skin flakes. They live in mattresses, pillows and upholstered furniture especially in bedrooms, where you spend a lot of time sleeping.