The chemical composition of the dust was analyzed by non-target LC-HRMS, using the different cheminformatic approaches described above, resulting in 1,003 annotated chemicals (Level 1-3), with ninety features being statistically significantly different (ANOVA p-value<0.05). Table contains detailed information about all annotations, including statistical results and MetOrigin classifications, while Table contains the statistically significant chemicals only. The potential sources of these compounds according to the NORMAN-SLE and PubChem Compound TOC are shown in Figure , while the MetOrigin classifications are shown in Figure .