Most of the scientific research activity has focused on the atmospheric boundary layer,
where the photochemical smog constituents reach to high concentrations, resulting thus to
the often occurrence of air pollution episodes, especially over mega-cities (Jacovides al.,
1994; Kondratyev & Varotsos, 1996, 2002; Ozone monitoring, mapping, and public outreach,
1999; Varotsos et al., 2001, 2005). Surface ozone is known as one of the most important air
pollutants, therefore, much attention is paid to ozone concentration monitoring.
