Table S2 Typical sulfur isotope compositions (δ 34 S) of major atmospheric sources. Source 34 S [‰] References Precipitations Rainfall in Poland (SO4 2− ) +3.7 Trembaczowski and Hałas (1983) Snowpack in the Świętokrzyski National Park, south-central Poland (SO4 2− ) +6.0 Michalik (2006) Precipitations in southeastern Germany (SO4 2− ) +4.0 to +5.0 Tichomirowa et al. (2007) Precipitations in northern Czech Republic (SO4 2− ) +7.0 to +8.0 Novák et al., (2001) Precipitations in southwestern Poland (SO4 2− ) +2.0 to +3.0 Górka et al. (2008); Górka et al., (2017); Jȩdrysek (2000) Snow in the Świętokrzyski National Park (SO4 2− ) +3.8* This study
Anthropogenic sourcesGasoline and diesel oil (both SO2 and SO4 will yield a 34 S similar to that of the parent fuel)