bad smell
With the bad smell (I learn it, en:offensive odor to open), it points at an unpleasant thing among the bad smells that Homo sapiens can feel. It is one of seven model pollution prescribed in the Environmental Pollution Prevention Act, but it is a definition of "the unpleasantness" and the sense pollution that evaluating it is difficult, and individual difference is bigger than the noise. There is this and becomes that the bad smell as the regulation object by laws and ordinances says in everyday life that somewhat different. The sense of smell of the Homo sapiens is particularly sharp among the five senses and is instinctive, and I am sentenced to a primitive sense, and there are many domains of non-elucidation. It is thought that it developed to feel the material which the organic matter which decayed rises from with a bad smell to judge inference of the danger by the stench of death and a state of the food from a process of the evolution. It is said that there are hundreds of thousands of kinds materials which I can feel as a bad smell, and the component is considered to amount to several hundred with "a smell of ..." and the expressed thing routinely. For example, 500 kinds of materials are counted from a fragrance ingredient of the coffee. In addition, width is very wide, and it is known that various elements influence when Homo sapiens felt some kind of bad smells whether you feel it unpleasantly.