Aims Cl is a micronutrient mainly supplied via deposition of marine aerosols. We assessed the development of Cl concentrations and stocks in plants and soils of a tropical montane forest far from a downwind ocean during two decades (1998–2019). Methods We measured Cl concentrations in solid samples with a new combustion-based method. Results The Cl concentrations in leaves of 17 tree species ranged 0.04–1.6 g kg −1 . Three tre...