working zone

https://doi.org/10.1351/goldbook.16195
Space measuring up to \(\pu{2 m}\) over the level of the floor or platform that contains a worker’s permanent or temporary station.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1333 [Terms] [Paper]