In addition to the common allergens, there are many things in the air that can trigger allergies or asthma, even though they don't cause these conditions. Triggers include irritants (such as cigarette and wood smoke), strong odors, the common cold, flu or respiratory illness - even a change in the air temperature or pressure.

Allergens collect in our bedding, furniture and carpeting - and wherever else there is warmth and moisture. If not removed, they will accumulate, causing even more of a threat. Young children who crawl on carpeting, lie on upholstered furniture and spend much of their time in their bedrooms may be even more exposed to household allergens than adults.

Cleaning is an important part of managing allergens. Done properly, cleaning removes or reduces allergens. Done regularly, cleaning stops allergens from accumulating, which helps minimize allergy and/or asthma symptoms.

The simple acts of cleaning, vacuuming and dusting stir up the air and increase the level of allergens around the person doing the cleaning. And, just as with other airborne particles, cleaning products can trigger a response in some allergic or asthmatic people. However, particles from cleaning products remain in the air for only a short time, whereas the allergens they help get rid of will continue to accumulate if they are not removed.

Read and follow label directions on cleaning products. The label directions give the proper amount of product to use, how to safely use the product and any special precautions that should be taken. Clean in a well-ventilated area (open a window, turn on a fan, etc.). Then, leave the area after the cleaning task is completed. Try a variety of products to find the ones that work best for them, as people react differently to different ingredients. If using a spray product, spray the cleaner on a cloth or sponge instead of on the surface; then clean. Break housecleaning into small tasks and spread them over several days so exposure to airborne allergens and cleaning products is minimized. Have someone else do the cleaning if asthma is severe. Some cleaning products have no scent or are perfume free. People who are bothered by fragrances may want to try these products.