---
type: threshold
id: dieldrin-1-2-3-4-10-10-hexachloro-6-7-epoxy-1-4-4a-5-6-7-8-8a-octahydro-1-4-endo
asset: workplace-exposure-limits
title: "Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "60571 | S | Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene | -- | 0.25"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene"
pel_mgm3: "0.25"
verified: true
---
**Substance:** Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene

**PEL (mg/m³):** 0.25

> 60571 | S | Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene | -- | 0.25

Source: <https://www.dir.ca.gov/title8/5155.html>