... License.AtmosphericChemistry and Physics Aircraft measurements over Europe of an air pollution plume from Southeast Asia – aerosol and chemical characterization A. Stohl1, C. Forster1, 2, H. Huntrieser2, H. Mannstein2, ... suite of instruments for trace gas and aerosol measurements, whichallowed a detailed characterization of the chemical composi-tion and aerosol content of the Asian pollution plume. The plume ... background periods BG-I, BG-II and BG-III, and Asian plume encounters I–IV of flight A as defined in Fig. 10, and during the Asian plume encounters I–V, as well as periods S-I, S-II and BL asdefined in Fig....