Gas mixtures of compounds such as 1-butanol are regularly used for olfactometry testing applications. Examples of NPL's olfactometry gas standards are shown below. Other mixtures may be available on request.
| Component | Matrix gas | Amount fraction range from | Amount fraction range to |
| 1-butanol | Nitrogen or air | 20 μmol/mol | 100 μmol/mol |
| 1-pentene | Nitrogen or air | 1 μmol/mol | 80 μmol/mol |
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