Errata: Due to a coding error, monthly files with "dma8epax" statistics were wrongly aggregated. This concerns all gridded files of this metric as well as the monthly aggregated csv files. All erroneous files were replaced with corrected versions on Jan, 16th, 2018. Each updated file contains a version label "1.1" and a brief description of the error. If you have made use of previous TOAR data files with the "dma8epax" metric, please exchange your data files. Furthermore, some data were exchanged in December 2018 in the yearly statistics and aggregated data sets to avoid user confusion. While metrics had been correctly calculated, most users expected to find average "dma8" values when in fact 4th highest (in the case of dma8eu 26-highest) values were provided. Therefore, some data columns of "dma8epax" were replaced with "avgdma8epax" and the variable descriptions in the metadata were improved. As no actual new calculation of metrics took place, we assigned the same version label 1.1 to these data. Please make sure to use "avgdma8epax" data when you want to analyze average daily 8-hour maximum concentration values.