| Risk level | Meaning |
| Level 1 (especially serious risk) | Unacceptable risks, must be removed by possible measures. |
| Level 2 (more serious risk) | Risk should not be accepted and measures must be taken to reduce the risk unless the cost. |
| Level 3 (serious risk) | Risks should not be accepted and measures should be taken to reduce risks unless the risk reduction is exceeded beyond the benefits of risk reduction. |
| Level 4 (general risk) | Acceptable risks, further reduce risk when conditions permit |