Abstract
Surface ozone mixing ratio was monitored in Athens, Greece from 1901 to 1940. This historic ozone series is unique for southeastern Europe. The series provides ozone mixing ratio values for that period and therefore allows comparison with recent ones. The measurements were obtained using the De James colometric papers, which scale from 0 to 21. A re-evaluation of the data is attempted considering the dependence of the measurements' conversion on both the relative humidity and the exposure time. The newly estimated surface daily ozone values in Athens (1901–1940) vary around 20 ppb and reach their maximum and minimum values during the periods April-June and October-December respectively.
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