Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Odor intensity referencing scales (OIRS).
| Odor Intensity Levels | |||||||
|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | … | 8 | … | 12 | |
| 12-Point Scale | <10> | <20> | <40> | … | <1280> | … | <20480> |
| 8-Point Scale | <12> | <24> | <48> | … | <1550> | - | - |
<PPM>: water solution of n-butanol (ppm) with a geometric concentration progression of two. Temperature of water solution maintains at 27 ± 1 °C.
