The data set considered
In this paper, we aim to conduct a large-scale statistical analysis of air pollutants, typically (NO_x) and PM, on a European scale. Technically, we access our air quality monitoring data from a large number of locations in Europe through the interface “Saqgetr”, which is an R package available on the Comprehensive R Archive Network (CRAN)20. The vast majority of the accessible data are openly available from the…