Original: Odor analysis In Germany , the concentrations of odorants have since the 1870 's been defined by the '' Olfaktometrie '' , which helps to analyze the human sense of smell using the following parameters : odor substance concentration , intensity of odor , and hedonic assessment .
Simplified: Odor analysis The concentrations of odorant in Germany are defined by the '' Olfaktometrie '' since the 1870 's .