Submicron and supermicron aerosols were sampled at Maïdo from 15 March 2018 to 24 May 2018 in the framework of the OCTAVE (Oxygenated Compounds in the Tropical Atmosphere: Variability and Exchanges) project 33 during its intensive observation period, as already described in detail in Simu et al. (2021) . Briefly, ambient aerosols were collected using two high-volume air samplers at a flow rate of 1130 L/min (at local temperature and pressure) for each. One of the samplers performed daytime sampling (running between 07:00 and 18:00 local time), while the other performed nighttime sampling (running between 22:00 and 05:00 local time). Both samplers were turned off between 05:00 and 07:00 and between 18:00 and 22:00 local time, defined as transition periods. A cascade impactor (TE-230, Tish Environmental, Inc.) was attached to each high-volume air sampler to collect size-segregated aerosol samples. All aerosol samples were collected onto quartz-fiber filters. For the submicron size (bottom stage of the impactors; aerodynamic diameter < 0.95 μm) filter changes were performed every 2-3 days and the sampling was performed continuously. For the supermicron size, filters were changed less frequently (every 2-13 days) and sampling was not done continuously, giving rise to significant data gaps (see supplementary figure ). Mass concentrations of supermicron aerosols reported here correspond to the sum of the top four stages (aerodynamic diameter > 0.95 μm) of the impactor.