Table 7.
Chromium thresholds [36].
| Compartment | Agency | Description | Limits |
|---|---|---|---|
| Air | WHO | Air Quality Guidelines Chromium (VI) |
1 μg/m3 for lifetime risk of 4 × 10−2 |
| Workplace Air | OSHA | Legal limit over an 8-hour workday of Cr (VI) | 0.005 mg/m3 |
| OSHA | Legal limit over an 8-hour workday of Cr (III) | 0.5 mg/m3 | |
| OSHA | Legal limit over an 8-hour workday of Cr (0) | 1 mg/m3 | |
| NIOSH | Legal limit over a workday of 8 h for Cr (0), Cr (II) and Cr (III) | 0.5mg/m3 | |
| NIOSH | Exposure limit over a workday of 10 h for Cr (VI) | 0.001 mg/m3 | |
| Drinking water | WHO | Drinking-Water Quality Guidelines for total chromium | 0.05 mg/L |
| EPA | Maximum contaminant level for total chromium | 0.1 mg/L | |
| Bottled Water | FDA | Not to exceed the total chromium concentration | 0.1 mg/L |