【详细解释】 The Air Pollution Prevention Association (APPA, Association pour la Prevention de la Pollution Atmospherique) is a scientific and technical association that has been operating over 40 years, with a view to improve the knowledge and prevention of atmospheric pollution phenomena as well as their impact on human health and on the environment. Through the head office and 17 regional committees, the APPA has created a number of networks consisting of professional teams with multidisciplinary activities: physicians, chemists, engineers, doctors, epidemiologists, toxicologists, etc. The role of these networks is to gather information, provide advice, information and preventive information.