Buildings with poor IAQ may have unpleasant or musty odors or feel hot and stuffy. Some workers may complain about symptoms that happen at work and go away when they leave work, like having headaches or feeling tired. Fever, cough, and shortness of breath among employees can be symptoms of a more serious problem. Asthma and some causes of pneumonia (e.g., Legionnaires’ Disease and Hypersensitivity Pneumonitis) have been linked to IAQ problems. Not all exposures cause symptoms, so there is no substitute for good building management.