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Summary of estimated RfC values for CK.
| Derived from information in these sources | Estimated RfC (mg/m3) | Uncertainty factor for route-to-route extrapolation |
| Opresko et al. 1998 | 0.11 | 1 |
| 0.035 | 3 | |
| USEPA IRIS | 0.18 | 1 |
| 0.058 | 3 | |
| USEPA Region 9a | 0.18a | 1a |
aWithdrawn in 2008.
