The use of CFCs, which are the main responsible for the ozone depletion in the upper atmosphere and the formation of
the so-called “ozone hole” over Antarctic Region, was phase out by Montreal Protocol (1989). CFCs' concentration is
recently reported to decrease in the free atmosphere, but severe episodes of ozone depletion in both Arctic and Antarctic
regions are still occurring. Nevertheless the complete recovery of the Ozone layer is expected by about 2050.
Recent simulation of perturbations in stratospheric chemistry highlight that circulation, temperature and composition are
strictly correlated and they influence the global climate changes. Chemical composition plays an important role in the
thermodynamic of the atmosphere, as every gaseous species can absorb and emit in different wavelengths, so their
different concentration is responsible for the heating or cooling of the atmosphere.
Therefore long-term observations are required to monitor the evolution of the stratospheric ozone layer. Measurements
from satellite remote sensing instruments, which provide wide coverage, are supplementary to selective ground-based
observations which are usually better calibrated, more stable in time and cover a wider time span. The combination of
the data derived from different space-borne instruments calibrated with ground-based sensors is needed to produce
homogeneous and consistent long-term data records. These last are required for robust investigations and especially for
Here, we perform a review of the major remote-sensing techniques and of the principal datasets available to study the
evolution of ozone layer in the past decades and predict future behavio