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The Tropospheric Ozone Assessment Report (TOAR) database of global surface observations is the world's most extensive collection of surface ozone measurements and includes also data on other air pollutants and on weather for some regions. Measurements from 1970 to present have been collected in a relational database, and are made available via a graphical web interface, a REST service (https://join.fz-juelich.de/services/rest/surfacedata/) and as aggregated products on PANGAEA (https://doi.pangaea.de/10.1594/PANGAEA.876108).