Cadmium is a metal that poses significant health risks, particularly in occupational environments where exposure can happen. The main objective of this scoping review is to review the cadmium exposure levels in the different occupational settings in the European Union (EU), considering the regulatory measures currently in place. The secondary objectives, depending on the availability of data, are (a) to identify the occupational settings where higher exposure levels occur, (b) to identify any geographical and temporal differences and trends within the EU and (c) to identify the most relevant co-exposures reported.

A scoping review will be conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses Extension for Scoping Reviews reporting guidelines. Studies reporting quantitative occupational data on cadmium exposure obtained through human biomonitoring and/or air monitoring will be included. A descriptive analysis of the findings will be performed.

This protocol for a scoping review does not require ethical approval as it is based on secondary data. The dissemination plan of the scoping review includes its publication in a scientific journal of reference, as it is expected that it will provide important knowledge to support ongoing and future occupational health interventions in the EU, at the technical and regulatory levels.

This study is registered at the Open Science Framework (OSF), 7 April osf.f2w3h.