Abstract
During the last decades of the 19th century day-time and night-time data of surface ozone were collected by means of the Schönbein method at the coastal observatories of Rio de Janeiro, Brazil (23°S) and Manila, Philippines (14°N) and at the mountain observatory of Oaxaca de Juarez, Mexico (17°N, 1574 m a.s.l.). Taking into account the uncertainties of the method, daily readings have been converted to ppbv concentrations by a procedure already applied to other series of historical data. The calculated time-averaged values show that 1 century ago the ozone levels at tropical latitudes were considerably lower than at mid-latitudes of the northern and southern hemispheres, similar to the present-day measurements.
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