The crossword solution for the term NORMAL LEVELS is PARS, which stands for Physiological and Radiological Surveillance. This is a type of medical surveillance that is used to monitor the health of individuals who are exposed to hazardous materials or environments. It involves the use of physical examinations, laboratory tests, and imaging studies to detect any changes in the body that may be caused by exposure to hazardous materials. The goal of this type of surveillance is to ensure that individuals remain at normal levels of health and safety.