Table 4. Classification of Odor Intensity by the Human Nose

Degrees	Intensity	Properties
0	None	People cannot feel an odorous smell with a normal sense of smell
1	Threshold	People smell something but cannot recognize the type of smell
2	Moderate	People smell something and can recognize the type of smell
3	Strong	People easily smell something strongly like a cresol smell in hospitals
4	Very Strong	People strongly smell something like a conventional rest room
5	Over Strong	People strongly smell something and gag or hold their breath