This book presents a technique to retrieve ozone profiles from SCIAMACHY/Envisat observations of scattered solar radiation in limb viewing geometry. The retrieval combines spectral information in the Chappuis and Hartley absorption bands to infer ozone profiles in the altitude range from the lower stratosphere to the middle mesosphere and employs the SCIATRAN radiative transfer model. Two aspects related to ozone profile retrievals are focused on the following. First, a comprehensive sensitivity study of ozone retrievals from limb-scattered radiance measurements to tropospheric clouds is presented. Second, the chemical ozone loss in the polar winter/spring stratosphere using the vortex average method is quantified. She also shows the correlation of chemical ozone loss and PSC as observed from SCIAMACHY limb measurements. Furthermore, the vertical variation of the chemical ozone loss from SCIAMACHY limb measurements is compared with results from other instruments and techniques.