# WHO/IARC ELF magnetic field association threshold (0.3–0.4 µT)

> The average daily exposure level above which pooled epidemiological studies report an association with childhood leukaemia, and the basis for the IARC Group 2B classification of ELF magnetic fields.

- Canonical URL: https://emfbase.com/limits/who-elf-0-3-0-4-microtesla-association
- Collection: Exposure limits
- Record id: `limits:who-elf-leukaemia-association`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/limits/who-elf-0-3-0-4-microtesla-association

## Key values

- **Limit value:** 0.3–0.4 µT — Measured range — Pooled analyses of residential exposure epidemiology cited by WHO and IARC. — 0.3–0.4 µT = 3–4 mG. This is an epidemiological association, not an established causal threshold, and is far below all regulatory limits. [who-elf, iarc-monograph-80]
- **Quantity:** magnetic flux density
- **Frequency band:** 50/60 Hz
- **Population:** sensitive
- **Set by:** WHO ELF evidence framework (2007 assessment, factsheet current)
- **Kind:** Guideline — scientific recommendation

## Sources

- `who-elf` World Health Organization (2007). *Electromagnetic fields and public health: exposure to extremely low frequency fields*. https://www.who.int/teams/environment-climate-change-and-health/radiation-and-health/non-ionizing/exposure — government, link checked 2026-08-12
- `iarc-monograph-80` International Agency for Research on Cancer (2002). *IARC Monographs Volume 80: Non-Ionizing Radiation, Part 1: Static and Extremely Low-Frequency Electric and Magnetic Fields*. https://publications.iarc.who.int/98 — peer-reviewed, link checked 2026-08-12

Data licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Dataset version 2026.08.1. Retrieved from EMFBase, https://emfbase.com.

This record is reference data, not medical or legal advice. Regulatory limits, scientific guidelines and precautionary values are labelled separately and answer different questions.