DOHSBase

Webinar: Limit Values Hierarchy in DOHSBase

Fenneke Linker 1 min read

One of the key features of DOHSBase is the hierarchical presentation of occupational exposure limit values. In this webinar, we explain how the six hierarchy levels work and why the order of limit values matters.

The families of limit values

The DOHSBase hierarchy is built on the reliability of the underlying limit-value families. From the most reliable, unbiased health-based values at the top to modelling and expert judgment at the bottom — each tier plays its own role across compliance, safe work, and REACH product safety.

Families of Chemical Occupational Exposure Limit Values (EOLV): five tiers of a reliability hierarchy — Tier 1 unbiased health-based (RAC, SCOEL, DECOS, ACGIH-TLV), Tier 2 stakeholder-influenced health-based (AGS, NIOSH REL, EU IOEL), Tier 3 default factor prescriptive (Dutch Health Council), Tier 4 hazard banding (kick-off values, control banding), Tier 5 modelling/expert judgment (MTD, RDSO, QSAR)

Decision tree for limit values

Decision tree for selecting an occupational exposure limit: is there a public legal limit? Gr and SCOEL? Search abroad or producer? Derive the limit yourself? Producing levels 0, I, II, III

Note: decision tree labels are in Dutch (source material). English translations in the call-out above.

A concrete hierarchy example

Example limit-value hierarchy for a single substance in the Netherlands with three ranks: kick-off value as workplace atmosphere, Dutch Arbo-besluit GHS/CLP classification H361/H362, and IARC scientific substantiation

The full presentation is available as a PDF download.

Video

The Six Hierarchy Levels

  1. Legal limit value in your own country
  2. Health-based limit values without stakeholder influence
  3. Health-based limit values with possible stakeholder influence
  4. Limit values calculated with standard factors (including DNELs)
  5. Limit values based on Hazard Banding systems (including kick-off values)
  6. Single endpoint and judgment-based values

Read more in our detailed article on the limit values hierarchy.

webinar limit values hierarchy

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