The definition and compliance with occupational limit values for pollutants in the workplace are the main tool for risk reduction and prevention of possible adverse health effects. There is no doubt that the decisions on the limit values are now closely linked to what produced in the European Community, if not at the international level. However, we believe that Scientific Associations should play a role in proposing and updating the limit values adopted by law in Italy. Become prominent interlocutors of lawmakers and institutional bodies is equally important.