RF Safe

Measurement and Analysis of the Radio-Frequency Electromagnetic Environment in Downtown Areas of Beijing

2020 · No effect · Low evidence

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No effectLow evidencePaper 1706

RF EMF levels were measured from 10 MHz to 8.0 GHz across ~1 km^2 in each of three downtown Beijing areas (108 total points) and mapped using Kriging interpolation. Reported highest electric field levels were 4.9 V/m (Xidan), 3.0 V/m (Wangfujing), and 3.9 V/m…

Study snapshot

Publicationmanual · 2020
Study typeexposure_assessment
Reported directionNo effect
Evidence ratingLow

Abstract

Measurement and Analysis of the Radio-Frequency Electromagnetic Environment in Downtown Areas of Beijing Xinwei Song, Yuntao Yue, Xinyue Zhu, Hao Chang. Measurement and Analysis of the Radio-Frequency Electromagnetic Environment in Downtown Areas of Beijing. 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE. Rome, Italy. 23-25 Sept. 2020. DOI: 1 0.1109/EMCEUROPE48519.2020.9245764. Abstract Public exposure to electromagnetic fields in the environment has been steadily increasing as the development and application of various wireless technologies, especially the coming of the 5G era. The growing concern about the possible consequent health risks prompts many organizations to conduct relevant studies and set limits to the exposure levels. The spatial distributions of the electromagnetic environment become very important data. The aim of this paper is to investigate the radio-frequency electromagnetic environment in Beijing by measuring the electromagnetic field levels of three representative downtown areas from 10 MHz to 8.0 GHz. The spatial distributions of the electromagnetic field in measured areas are illustrated as two- dimensional maps through interpolation techniques. These results are analyzed with reference to the exposure level limits in China and the official annual report of the national radiation environment. ieeexplore.ieee.org Excerpts The applications of wireless communication and data transmission mainly work in the radio frequency (RF) band. In China, for example, the frequency band of FM broadcasting is 87-108 MHz; that of digital television is 407-806 MHz; BeiDou Navigation Satellite System works at 1589.742 MHz, 1561.098 MHz, etc.; mobile phones with 4G TD-LTE networks work in 1880-1900 MHz, 2320-2370 MHz, etc.; several channels around 2.4 GHz and 5 GHz are allocated to Wi-Fi. There are also many other wireless applications, such as Near Field Communication (NFC), Radio Frequency Identification (RFID), Narrow Band Internet of Things (NB-IoT) and so on. All this means there are numerous artificial electromagnetic sources in the environment, and all populations are exposed to varying degrees of electromagnetic fields (EMFs). The instrument used for the EMF measurements is ElectroSmog Meter TES-593 [11]. It is a device with three- channel probe for three-axis isotropic measurements of EMF from 10 MHz to 8.0 GHz. The highest electric field levels in Xidan, Wangfujing and Guomao are 4.9 V/m, 3.0 V/m and 3.9 V/m. In this paper, the RF EME of three representative downtown areas in Beijing was studied. The EMF levels of an about 1 km2 zone in each area were measured. The total measured points were 108, and the levels at unmeasured points were estimated through Kriging interpolation method. Thus, the EME maps corresponding to geographical locations could be drawn. The results show that the average EMF level rose 44.4% (from 0.9 V/m to 1.3 V/m) compared with that in 2018. Nevertheless, the maximum EMF level was below the limits in the national standard. Hence, the RF EME in these areas does not appear to have any known consequence on public health currently.

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
PopulationGeneral public in three downtown areas of Beijing (Xidan, Wangfujing, Guomao)
Sample size108
ExposureRF
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

RF EMF levels were measured from 10 MHz to 8.0 GHz across ~1 km^2 in each of three downtown Beijing areas (108 total points) and mapped using Kriging interpolation. Reported highest electric field levels were 4.9 V/m (Xidan), 3.0 V/m (Wangfujing), and 3.9 V/m (Guomao). The average EMF level increased 44.4% (0.9 to 1.3 V/m) compared with 2018, while the maximum level remained below the national standard limits.

Outcomes measured

  • Electric field strength (V/m)
  • Spatial distribution maps of RF electromagnetic environment (EME)
  • Comparison to Chinese national exposure limits
  • Change in average EMF level vs 2018

Limitations

  • Health outcomes were not measured; conclusions about public health are based on comparison to exposure limits
  • Exposure metric reported as electric field strength; SAR not reported
  • Limited to three downtown areas and a finite number of measurement points (108) with interpolation for unmeasured locations
  • Time period/measurement timing not specified in the provided abstract/excerpts
View raw extracted JSON
{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "RF",
    "source": "environmental/urban ambient (multiple RF services)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "General public in three downtown areas of Beijing (Xidan, Wangfujing, Guomao)",
  "sample_size": 108,
  "outcomes": [
    "Electric field strength (V/m)",
    "Spatial distribution maps of RF electromagnetic environment (EME)",
    "Comparison to Chinese national exposure limits",
    "Change in average EMF level vs 2018"
  ],
  "main_findings": "RF EMF levels were measured from 10 MHz to 8.0 GHz across ~1 km^2 in each of three downtown Beijing areas (108 total points) and mapped using Kriging interpolation. Reported highest electric field levels were 4.9 V/m (Xidan), 3.0 V/m (Wangfujing), and 3.9 V/m (Guomao). The average EMF level increased 44.4% (0.9 to 1.3 V/m) compared with 2018, while the maximum level remained below the national standard limits.",
  "effect_direction": "no_effect",
  "limitations": [
    "Health outcomes were not measured; conclusions about public health are based on comparison to exposure limits",
    "Exposure metric reported as electric field strength; SAR not reported",
    "Limited to three downtown areas and a finite number of measurement points (108) with interpolation for unmeasured locations",
    "Time period/measurement timing not specified in the provided abstract/excerpts"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "radio-frequency",
    "RF EMF",
    "electromagnetic environment",
    "exposure assessment",
    "urban measurements",
    "Beijing",
    "10 MHz to 8 GHz",
    "Kriging interpolation",
    "5G era",
    "China exposure limits"
  ],
  "suggested_hubs": [
    {
      "slug": "5g-policy",
      "weight": 0.32,
      "reason": "Mentions the coming of the 5G era as context for increasing RF exposure, though measurements span 10 MHz–8 GHz and are not explicitly 5G-specific."
    }
  ]
}
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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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