Heiderich S, et al. - Given volatile anaesthetics are a potential hazard during occupational exposure, researchers used a prospective observational study design to evaluate concentrations of volatile anaesthetics (sevoflurane) in relation to room size, number of patients and ventilator settings in two different postanaesthesia care units (PACUs) of the Hannover Medical School (Hannover, Germany). Absolute trace gas room concentrations of sevoflurane measured with a compact, closed gas loop high-resolution ion mobility spectrometer was included as the main outcome measure. They detected low trace amounts of sevoflurane in both PACUs equipped with controlled air exchange systems. No exceed was noted in occupational exposure limits.