| Odor Intensity | Scale | |
| Numerical | Characteristic | |
| No odor | 1 | Faint and not irritating |
| Normal | 2 | Weak and a little annoying intensity of smell |
| Moderately strong | 3 | Noticeable and annoying odor |
| Strong | 4 | Tough and very annoying intensity |
| Very strong | 5 | Extremely exasperating odor |