Gas leakage and distribution characteristics of methyl bromide and sulfuryl fluoride during fumigations in a pilot flour mill

► The half-loss times (HLTs) during three methyl bromide (MB) and three sulfuryl fluoride (SF) fumigations were determined. ► Concentration differences of both fumigants within the mill ranged from 2 to 7 g/m3. ► The observed HLTs for the MB and SF fumigations were in the range of 3.61-28.64 h and 9.97-31.65 h, respectively. ► HLTs were inversely related only to wind speeds.