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Evaluating extremely low frequency magnetic fields in the rear seats of the electric vehicles

2018 · No effect · Low evidence

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No effectLow evidencePaper 1891

Magnetic flux density measured in the rear seats of 10 electric vehicles during different driving sessions was reported to be far below International Commission on Non-Ionizing Radiation Protection reference levels. Although small children may be exposed to h…

Study snapshot

Publicationmanual · 2018
Study typeexposure_assessment
Reported directionNo effect
Evidence ratingLow

Abstract

Evaluating extremely low frequency magnetic fields in the rear seats of the electric vehicles Lin J, Lu M, Wu T, Yang L, Wu TN. Evaluating extremely low frequency magnetic fields in the rear seats of the electric vehicles. Radiation Protection Dosimetry. 182(2):190-199. Dec 2018. Abstract In the electric vehicles (EVs), children can sit on a safety seat installed in the rear seats. Owing to their smaller physical dimensions, their heads, generally, are closer to the underfloor electrical systems where the magnetic field (MF) exposure is the greatest. In this study, the magnetic flux density (B) was measured in the rear seats of 10 different EVs, for different driving sessions. We used the measurement results from different heights corresponding to the locations of the heads of an adult and an infant to calculate the induced electric field (E- field) strength using anatomical human models. The results revealed that measured B fields in the rear seats were far below the reference levels by the International Commission on Non-Ionizing Radiation Protection. Although small children may be exposed to higher MF strength, induced E-field strengths were much lower than that of adults due to their particular physical dimensions. ncbi.nlm.nih.gov

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeexposure_assessment
Effect directionno_effect
PopulationAdults and infants (anatomical human models used to estimate induced electric fields); rear-seat occupants in electric vehicles
Sample size10
ExposureELF · different driving sessions
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Magnetic flux density measured in the rear seats of 10 electric vehicles during different driving sessions was reported to be far below International Commission on Non-Ionizing Radiation Protection reference levels. Although small children may be exposed to higher magnetic field strength due to proximity to underfloor electrical systems, the calculated induced electric field strengths were reported to be much lower than those of adults because of children’s physical dimensions.

Outcomes measured

  • Magnetic flux density (B) in rear seats
  • Induced electric field (E-field) strength (calculated using anatomical human models)
  • Comparison to ICNIRP reference levels

Limitations

  • Specific ELF frequency content not reported in the abstract
  • Measurement methods/instrumentation and exact measurement locations/heights not detailed in the abstract
  • Only 10 electric vehicles were measured
  • Induced E-field was calculated using anatomical models rather than directly measured
View raw extracted JSON
{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "ELF",
    "source": "electric vehicle",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "different driving sessions"
  },
  "population": "Adults and infants (anatomical human models used to estimate induced electric fields); rear-seat occupants in electric vehicles",
  "sample_size": 10,
  "outcomes": [
    "Magnetic flux density (B) in rear seats",
    "Induced electric field (E-field) strength (calculated using anatomical human models)",
    "Comparison to ICNIRP reference levels"
  ],
  "main_findings": "Magnetic flux density measured in the rear seats of 10 electric vehicles during different driving sessions was reported to be far below International Commission on Non-Ionizing Radiation Protection reference levels. Although small children may be exposed to higher magnetic field strength due to proximity to underfloor electrical systems, the calculated induced electric field strengths were reported to be much lower than those of adults because of children’s physical dimensions.",
  "effect_direction": "no_effect",
  "limitations": [
    "Specific ELF frequency content not reported in the abstract",
    "Measurement methods/instrumentation and exact measurement locations/heights not detailed in the abstract",
    "Only 10 electric vehicles were measured",
    "Induced E-field was calculated using anatomical models rather than directly measured"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "extremely low frequency",
    "magnetic fields",
    "electric vehicles",
    "rear seats",
    "children",
    "infants",
    "magnetic flux density",
    "induced electric field",
    "ICNIRP",
    "exposure assessment"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.15,
      "reason": "In-vehicle exposure assessment context; not clearly occupational but relates to exposure during vehicle use."
    }
  ]
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: Not supplied
PubMed: Not supplied

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