ScienceDaily: What is the origin of the volatile hydrocarbons, other than methane, present in city air? Mainly gasoline-powered vehicles[1], according to a study carried out by a French-US team[2] including French researchers from the Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA/IPSL[3], CNRS / UPEC / Université Paris Diderot) and the Laboratoire des Sciences du Climat et de l'Environnement (LSCE/IPSL, CNRS / CEA / Université de Versailles Saint-Quentin-en-Yvelines). The study also shows...