Concentrating on eliminating allergens from the bedroom is often an effective first step, since children spend eight to twelve hours each day in the bedroom. Dust mites are microscopic organisms which live in bedding, rugs, and upholstered furniture. The most effective way to decrease your child's contact with dust mites is to cover the bedding, mattresses and box springs in air-tight vinyl or nylon cases that zip shut. Also, remove drapes and upholstered furniture and wash linens, area rugs and stuffed animals frequently using water hotter than 130 degrees. Cold or warm water does not kill dust mites.
Mold grows where humidity is high.
In addition to the above measures, use chlorine bleach to reduce mold growth in bathrooms, cellars and other damp areas. Pets with fur or feathers should be given away, but if this is not possible at least do not let them in the child's bedroom. A weekly bath will decrease the amount of allergen a furry animal sheds. Outside the problem is usually pollen. Pollen counts are the highest between 5 a.m. and 10 a.m., so keep your child's bedroom window closed at night during pollen season.