# Are exposure limits based only on heating?

> Yes: limits derive from thermal and nerve-stimulation thresholds divided by a safety factor. Whether sub-thermal effects exist is the open dispute.

- Canonical URL: https://emfbase.com/questions/are-emf-limits-based-only-on-heating
- Collection: Direct answers
- Record id: `questions:are-emf-limits-based-only-on-heating`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/questions/are-emf-limits-based-only-on-heating
- Also known as: thermal only limits, are EMF limits outdated, non thermal effects limits

## Key values

- **Topic:** safe levels

## Question

Is it true that RF exposure limits only protect against heating?

## Answer

Substantially yes, and that is the crux of the dispute. ICNIRP and FCC limits are derived from the exposure at which established effects occur — tissue heating above about 100 kHz, nerve stimulation below it — then divided by a safety factor, typically 50 for the general public. ICNIRP's position is that no effect below the thermal threshold has been demonstrated consistently enough to base a limit on; precautionary frameworks such as BioInitiative and EUROPAEM assume such effects exist and propose targets orders of magnitude lower. This site labels every value as regulatory, guideline or precautionary so you can see which assumption a number rests on.

## Related records

- [Thermal effect](https://emfbase.com/glossary/thermal-effect): Tissue heating from absorbed RF energy — the established mechanism that RF exposure limits are set to prevent, with a safety margin.
- [Non-thermal effect](https://emfbase.com/glossary/non-thermal-effect): A proposed biological effect at exposure levels too low to cause measurable heating; the central claim of precautionary guidelines and the central objection of regulators.
- [Precautionary principle (as applied to EMF)](https://emfbase.com/glossary/precautionary-principle): The basis for values set below the level justified by established effects, such as the Swiss installation limits and building-biology bands.

## Sources

- `icnirp-2020` International Commission on Non-Ionizing Radiation Protection (2020). *Guidelines for Limiting Exposure to Electromagnetic Fields (100 kHz to 300 GHz)*. https://www.icnirp.org/en/publications/article/rf-guidelines-2020.html — guideline, link checked 2026-08-12
- `fcc-1310` U.S. Government Publishing Office (eCFR). *47 CFR § 1.1310 — Radiofrequency radiation exposure limits*. https://www.ecfr.gov/current/title-47/section-1.1310 — regulation, link checked 2026-08-12
- `bioinitiative-2012` BioInitiative Working Group (2012). *BioInitiative Report 2012 (updated) — conclusions and recommended precautionary levels*. https://bioinitiative.org/conclusions/ — ngo, link checked 2026-08-12
- `europaem-2016` European Academy for Environmental Medicine (2016). *EUROPAEM EMF Guideline 2016 for the prevention, diagnosis and treatment of EMF-related health problems*. https://europaem.eu/en/library/blog-en/97-europaem-emf-guideline-2016 — ngo, 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.