people who work in large office buildings get sick more often normal . they may have headaches, stomachaches, or sore, red skin. the reason for this lies in the building themselves. these large building usually have windows that cannot be opened. the same air stays in the building for a long time and becomes unhealthy. it may be full of cigarette smoke. this unhealthy air causes " sick building syndrome," as doctors call this problem. in order to cure the people with this syndrome, it is necessary to treat the building. the answer is simple: more fresh air.