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Aerosols from natural and antropogenic sources are one of the atmosphericcomponents that have the largest spacial-temporal variability, depending on thetype (land or ocean) surface, human activity and climatic conditions (mainlytemperature and wind). Since Cherenkov photons generated by the incidence of aprimary ultraenergetic cosmic gamma photon have a spectral intensitydistribution concentrated in the UV and visible ranges [Hillas AM. SpaceScience Reviews, 75, 17-30, 1996], it is important to know the aerosolconcentration and its contribution to atmospheric radiative transfer. Wepresent results of this concentration measured in typical rather calm (notwindy) days at San Antonio de los Cobres (SAC) and El Leoncito/CASLEO proposedArgentinean Andes range sites for the placement of the Cherenkov TelescopeArray (CTA). In both places, the aerosol concentration has a peak in the2.5-5.0$\mu$m range of the mean aerosol diameter and a very low mean totalconcentration of 0.097$\mu$g/m$^3$ (0.365$\mu$g/m$^3$) for SAC(CASLEO). Thedata were collected the days 15/Dec/2012 (27-28/Dec/2012) for the first(second) place with a GRIMM aerosol spectrometer, who determines the aerosolconcentration at a given diameter (0.22-32 $\mu$m range) with a lasertechnique. We also present AOD values for each CTA proposed place, derived withthe improved Deep Blue algorithm, from data measured by SEAWiFS instrument onboard of SeaStar/NASA satellite. They have very low mean values, determined forthe 1998-2010 period, AOD$_{550nm, SAC}$ = 0.026 $\pm$ 0.011 and AOD$_{550nm,CASLEO}$ = 0.030 $\pm$ 0.014. Also, we introduce the spectral (380 nm) solarirradiance as a test in these sites of the tropospheric UV atmospherictransmittance.

Typical atmospheric aerosol behavior at the Cherenkov Telescope Array candidate sites in Argentina