In this letter, we exploit the polarization property of light to investigate the Ångströmexponentdescribing the wavelength dependence of optical backscatter between two wavelengths. Where previous interpretation of Ångströmexponent was that of a particlessize indicator, the use of light polarization makes it possible to investigate the Ångströmexponent dependence on the particles shape by separately retrieving the backscattering Ångströmexponent of the spherical (s) and non-spherical (ns) particles contained in an atmospheric particle mixture (p) = {s, ns}. As an output, analytical solutions of the Maxwell’s equations (Lorenz-Mie theory, spheroidal model) can then be applied to investigate the Ångströmexponent dependence on the particles size and complex refractive index for each assigned shape. Interestingly, lidar-retrieved vertical profiles of backscattering Ångströmexponents specific to s and ns-particles can be used by the optical community to evaluate a range ofinvolved particles sizes and complex refractive indices for both particles shapes, spherical and non-spherical, as we remotely demonstrate on a case study dedicated to a dust nucleation event.