# Building Biology SBM-2024 AC magnetic field bands

> Sleeping-area grades at 50/60 Hz: below 0.2 mG no anomaly, 0.2–1 mG weak, 1–5 mG strong, above 5 mG extreme.

- Canonical URL: https://emfbase.com/limits/building-biology-ac-magnetic-bands
- Collection: Exposure limits
- Record id: `limits:sbm-2024-magnetic-bands`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/limits/building-biology-ac-magnetic-bands

## Key values

- **Limit value:** 0.2–5 mG — Precautionary value — not law anywhere — Equivalent in nT: <20 / 20–100 / 100–500 / >500. Harmonics from ~2 kHz to 1 MHz are graded more severely, by a factor of roughly 10–100. [sbm-2024]
- **Quantity:** magnetic flux density
- **Frequency band:** power frequency and harmonics
- **Population:** sensitive
- **Set by:** Building Biology SBM-2024 evaluation guidelines (2024)
- **Kind:** Precautionary — not law anywhere

## Sources

- `sbm-2024` Institut für Baubiologie + Nachhaltigkeit (IBN) (2024). *Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024)*. https://buildingbiology.com/site/downloads/SBM-2024_EVALUATION_GUIDELINES_EN.pdf — 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.