Theoretical and observational study to estimate the contribution of natural and anthropogenic aerosols, the tiny suspended particles in the air, to the perturbation of Earths radiation budget is described in this book. This book contains six chapters, starting with a brief introduction about the properties of aerosols and their role in climate. Ground-based measurement techniques for investigating the basic aerosol properties are described in the second chapter. The changes in aerosol properties due to dust storms, fog, long-range transport of anthropogenic aerosols and also the seasonal...