This document presents the validation results for the 16-year reanalysis run, 2003 - 2018, focussing on aerosols and reactive gases. Earlier versions of this document have appeared during the production of the reanalysis: after completing year 1 (2003), year 5 (2003-2007), year 14 (2003- 2016) and year 15 (2003-2017) (Bennouna et al., 2019). The evaluation of the greenhouse gas reanalysis (CO2, CH4) will be discussed in a separate series of reports (Ramonet et al., 2019). This summary is split according to service themes as introduced on the CAMS website: air quality & atmospheric composition, climate forcing, ozone layer and UV. Specific attention is given to the ability of the CAMS system to capture events. The CAMS reanalysis is compared to the previous MACC reanalysis, available for the period 2003-2012, and to a control run without atmospheric composition data assimilation.