{
  "id": "limits:japan-head-sar",
  "collection": "limits",
  "slug": "japan-head-sar-limit",
  "name": "Japan handset local SAR limit (head)",
  "summary": "2 W/kg averaged over any 10 g of tissue and any six minutes, mandatory for equipment used close to the head since June 2002.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "standardId": "japan-rrpg",
    "population": "general-public",
    "quantity": "specific-absorption-rate",
    "band": {
      "minHz": 100000,
      "maxHz": 300000000000,
      "label": "equipment used near the head"
    },
    "averagingSeconds": 360,
    "value": {
      "quantity": "specific-absorption-rate",
      "unit": "W/kg",
      "value": 2,
      "basis": "regulatory",
      "note": "Equipment with an average power below 20 mW is exempt. The 10 g averaging mass matches the EU/ICNIRP convention, so Japanese figures are comparable with European declared SAR values but not with U.S. FCC values averaged over 1 g against a 1.6 W/kg limit.",
      "sourceIds": [
        "japan-mic-rrpg"
      ]
    },
    "related": [
      "limits:icnirp-2020-sar-local",
      "limits:fcc-sar-partial-body",
      "questions:why-does-phone-sar-differ-between-us-and-europe"
    ]
  },
  "sources": [
    {
      "id": "japan-mic-rrpg",
      "title": "Possible Health Effects on the Human Body from Radio Wave Exposure — Radio Radiation Protection Guidelines",
      "publisher": "Ministry of Internal Affairs and Communications, Japan",
      "url": "https://www.tele.soumu.go.jp/e/sys/ele/body/index.htm",
      "kind": "government",
      "retrieved": "2026-08-12"
    },
    {
      "id": "japan-radio-law-table",
      "title": "電波法施行規則 第21条の3 および別表第2号の3の2 — 電波の強度の値 (Radio Law Enforcement Regulations, art. 21-3 and appended table 2-3-2: permitted radio-wave field strengths)",
      "publisher": "総務省 電波利用ポータル (Ministry of Internal Affairs and Communications, Japan)",
      "url": "https://www.tele.soumu.go.jp/j/sys/ele/medical/system/laws/index.htm",
      "kind": "regulation",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/limits/japan-head-sar-limit",
    "html": "https://emfbase.com/limits/japan-head-sar-limit",
    "markdown": "https://emfbase.com/limits/japan-head-sar-limit.md",
    "collection": "https://emfbase.com/api/limits"
  }
}