An attempt is made for a first general study of the relation between high/very high concentrations of
nitrogen dioxide and ozone with the discomfort index (DI) values. The nitrogen dioxide data of
«Patision» station and ozone data of «Liosia» and «Marousi» station have been analysed. The relation
between air pollution episodes and the corresponding values of DI during the period 1993-1995 have
been examined for the Greater Athens Area (GAA). For the warm period of the year, the frequency of
the DI values for different levels of air pollution in the GAA is also examined.