| No | Unit | SI Unit | Description |
|---|---|---|---|
| 1 | ppm | μmol/mol | parts per million |
| 2 | ppb | nmol/mol | parts per billion |
| 3 | ppt | pmol/mol | parts per trillion |
| 4 | permil | mmol/mol | per mille |
| 5 | Bq/m3 | ||
| 6 | μmol/kg | ||
| 7 | μmol/l | ||
| 8 | mBq/m3 | ||
| 9 | pmol/kg | ||
| 10 | nmol/kg | ||
| 11 | μg/m3-20C | ||
| 12 | mg/m3-25C | ||
| 13 | μg/m3-25C | ||
| 14 | fmol/kg | ||
| 15 | per meg | ||
| 88 | Unknown |