EARLINET climatological lidar observations are performed on a regular schedule of one daytime measurement per week around noon (on Monday), when the boundary layer is usually well developed, and two night-time measurements per week (on Monday and Thursday), with low background light, in order to perform Raman extinction measurements. This regular schedule for observations minimizes the bias in the dataset possibly related to specific measurement conditions. The resulting dataset is used to obtain unbiased data for climatological studies.

                This dataset contains profiles of aerosol extinction, backscatter and lidar ratio.
                Several aerosol extinction/backscatter datasets can be present for the same
                climatological measurement in order to provide profiles either with a better temporal
                resolution or with an extended height range by using a larger temporal average.

                This is by far the largest dataset on the aerosol vertical distribution, and it is
                the only one which is collected systematically and is covering a whole continent.