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The present study verifies the thermo hygrometric comfort conditions in subjects of a university library users, evaluating the differences and peculiarities in the data collected at the measurement campaign. Particularities of the investigation is the period studied concerning the time frame of the Middle season, which is not expected to power the air conditioning systems. Based on assumptions on the thermal resistance of clothing in the spring and the metabolic type of subjects, the environmental parameters were monitored in some work position in the reading hall in the library of the Faculty of Medicine and Surgery of the University of Palermo. The article presents analyses of the measured data correlating the passive structure behavior and the variation of the internal temperature increases caused by the occupants and by the external temperature gradient. These results are compared with the limits and the guidelines provided by legislation for the main variables measured and derived, and which constitute the essential support to test the tolerability of the occupiers against the thermal environment with which they interact. Keywords: PMV PPD Indexes, Thermo-hygrometric comfort, acceptability classes.

Introduction: The responsibility of the Department for Prevention and Safety at the workplace of the Palermo Health Authority (ASP) is to monitor and coordinate the activity of occupational physicians operating in Palermo and its province. One of its obligations is to examine appeals "against the judgment of occupational physicians", ".and, after carrying out further investigation, confirm, modify or reverse the ruling itself " (art. 41, par. 6, legislative Decree 81/08). Objectives: The purpose of this study was to analyze the appeals lodged against a "judgment of fitness for work" submitted to the "Health Prevention and Occupational Epidemiology Operative Unit" of the Department of Prevention and Safety at the Workplace of the ASP Palermo, from 2008 to 2010. Methods: The total number of appeals lodged during the three-year period was 211, 174 of which were finalized. Results: The most frequent job category among the appellants was that of blue-collar workers, in various sectors, covering 44.5% of the subjects under study (93 cases). In 64.2% of the processed appeals (131 cases), the judgment of the physician was modified, while in the remaining 36.8% (73 cases) it was confirmed.The work fitness judgment with restrictions was the category against which most appeals were lodged, and the diseases in question mostly concerned the osteoarticular and cardiovascular systems. Conclusion: In a context of continuous change in the labour field and the related risks to the health and safety of workers, the occupational physician must approach the worker in a comprehensive manner,through an assessment of the possible health problems and the working environment in which he/she operates.