A method for determining the location of a fecal insult, includes: detecting the concentration of at least one gas indicative of feces at a plurality of locations in a defined space and determining whether said concentration of said gas exceeds a predetermined first threshold value. The method includes: detecting the concentration of hydrogen gas at each of said locations detecting the concentration of at least one further gas component being indicative of feces in said space and determining that a fecal insult has occurred in a location where said detected concentration of hydrogen gas exceeds said first threshold value, provided that the detected concentration of said further gas component also exceeds a predetermined second threshold value in said location.
