Fig. 2
From: LESO: A ten-year ensemble of satellite-derived intercontinental hourly surface ozone concentrations

Site-level validation statistics of the LESO ensemble in terms of boxplots in all the three regions for four timescales (hourly, daily, weekly, and monthly). The unit of RMSE is μg/m3. The green triangles in the boxes are the mean values of the coefficient of determination (R2) and root mean squared error (RMSE).