{
  "id": "limits:sbm-2024-magnetic-bands",
  "collection": "limits",
  "slug": "building-biology-ac-magnetic-bands",
  "name": "Building Biology SBM-2024 AC magnetic field bands",
  "summary": "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.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "standardId": "sbm-2024",
    "population": "sensitive",
    "quantity": "magnetic-flux-density",
    "band": {
      "minHz": 16.7,
      "maxHz": 2000,
      "label": "power frequency and harmonics"
    },
    "value": {
      "quantity": "magnetic-flux-density",
      "unit": "mG",
      "value": 0.2,
      "max": 5,
      "basis": "precautionary",
      "note": "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.",
      "sourceIds": [
        "sbm-2024"
      ]
    }
  },
  "sources": [
    {
      "id": "sbm-2024",
      "title": "Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024)",
      "publisher": "Institut für Baubiologie + Nachhaltigkeit (IBN)",
      "url": "https://buildingbiology.com/site/downloads/SBM-2024_EVALUATION_GUIDELINES_EN.pdf",
      "year": 2024,
      "kind": "ngo",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/limits/building-biology-ac-magnetic-bands",
    "html": "https://emfbase.com/limits/building-biology-ac-magnetic-bands",
    "markdown": "https://emfbase.com/limits/building-biology-ac-magnetic-bands.md",
    "collection": "https://emfbase.com/api/limits"
  }
}