Carbon- and sulfur-bearing gases are emitted at relevant amounts from hydrothermal manifestations at Tivoli Terme (Latium, central Italy), where different potential anthropogenic contaminant sources also occur. This study presents a geochemical dataset including CO 2 , CH 4 , SO 2, and H 2 S concentrations and δ 13 C-CO 2 and δ 13 C-CH 4 values measured in air at the center of Tivoli town. The main aim was to evaluate the impa...