The present work shows an application of non-linear optics (NLO) with the aim to characterise aerosol particles by the measurement of the spectral response of their radiated light at 0° and 30° when exposed to a femtosecond laser light beam. A first optical setup has been developed to carry such measurements while ensuring to avoid any laser/optics pollution in the results. While Second Harmonic Generation (SHG) or Third Harmonic Generation (THG) were difficult to observe, a strong spectral signature of other NLO phenomena, such as fluorescence induced by femtosecond induced filamentation (FLIF) are observed. These signals are anlysed in terms of their amplitude for different aerosols (CAST soot particles and DEHS particles). The results suggest, that weak SHG signals might exist but that they are covered by FLIF. Finally based on these findings, a novel experimental setup for future works is proposed.