Author’s contributions
IM and JH conceived the study. RM and FW classified Leipzig trees into allergenic and non-allergenic. KdH developed air pollution grids. IM assigned all GIS variables to participants, analysed the data and wrote the first draft of the manuscript. FW contributed to drafting the first version of the manuscript. CB assisted with the data analysis. JH, GH and MS have made substantial contributions to the conception, design and acquisition of the LISA Leipzig data. All authors involved in the result interpretation and text revision. All authors approved the final manuscript.