Dealing with breathing problems is a major health issue in large urban areas, especially for the elderly. Respiratory allergies
are caused by pollen, mold or dust that circulates in the air. Moving to less humid climates where fewer pollinating plants grow is a good solution for old people. The elderly are more vulnerable to respiratory problems, so they get viral infections more frequently than most other people. Healthcare workers and nurses who deal with the elderly try to reduce indoor air pollution to help people breathe better.