LAGRANTO version 2.0 is a Lagrangian analysis tool used to track how particles move through the atmosphere. It is particularly useful for studying aerosol transport in the stratosphere—the atmospheric layer above the troposphere. In the context of stratospheric aerosol injection (SAI), aerosols are deliberately released into the stratosphere to reflect incoming solar radiation and help mitigate global warming. For SAI to be effective, the injected particles must remain in the stratosphere for extended periods. However, atmospheric processes such as wind, convection, and gravitational settling can alter the trajectories of these particles, potentially causing them to descend into the lower atmosphere or disperse more quickly than intended. This project focuses on simulating the movement of aerosols injected at altitudes accessible by existing aircraft. Using LAGRANTO, the trajectories of these particles are analyzed and compared with climate model outputs to identify discrepancies and evaluate how well the models represent stratospheric aerosol transport.