What are the best ways to avoid environmental allergens?

People who have allergic reactions should take steps to avoid coming into contact with allergens (the substances to which they are allergic). The most common environmental allergens are dust mites, mold, pet dander, and pollen. To avoid these, use hard flooring instead of carpet, vacuum often, wash sheets in hot water, and use dust mite pillow and mattress covers. Also close your windows, avoid the outdoors on wet, windy, or high pollen days, and wear a dust mask if necessary.