Optical spectroscopy is a well-developed scientific method to retrieve atmospheric constituents. A simple methodology is to study the interactions of a light source with the atmosphere. Examples of the interactions include absorption and scattering effect due to air molecules and aerosols. Depending on the trace gases or aerosols intended to be measured, different methodologies are applied. Differential Optical Absorption Spectroscopy (DOAS) is widely employed for the trace gas retrieval; whereas analysis of scattering process is used to determine the aerosol features. Experimentally, to...