Des scientifiques identifient un polluant à base de silicone omniprésent dans l'atmosphère mondiale

Des chercheurs ont découvert des niveaux étonnamment élevés de méthylsiloxanes, une classe de composés de silicone, dans des échantillons d'air provenant de villes, de zones rurales et de forêts à travers le monde. L'étude lie une grande partie de cette pollution aux émissions des véhicules issues d'additifs dans l'huile moteur. Les experts avertissent que l'inhalation quotidienne de ces substances par l'homme pourrait dépasser l'exposition à d'autres polluants connus comme les PFAS.

Les résultats proviennent d'une équipe de l'Université d'Utrecht et de l'Université de Groningue. Ils ont mesuré ces composés sur des sites aux Pays-Bas, en Lituanie et au Brésil. Les concentrations ont atteint 98 nanogrammes par mètre cube à São Paulo et ont chuté à 0,9 nanogramme par mètre cube dans une forêt lituanienne. Les polluants représentaient de 2 à 4,3 pour cent du total des aérosols organiques dans les échantillons testés.

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