RF EMF exposures in kindergarten children

Abstract

RF EMF exposures in kindergarten children Bhatt CR, Redmayne M, Billah B, Abramson MJ, Benke G.Radiofrequency-electromagnetic field exposures in kindergarten children.J Expo Sci Environ Epidemiol. 2016 Oct 19. doi: 10.1038/jes.2016.55. Abstract The aim of this study was to assess environmental and personal radiofrequency-electromagnetic field (RF-EMF) exposures in kindergarten children. Ten children and 20 kindergartens in Melbourne, Australia participated in personal and environmental exposure measurements, respectively. Order statistics of RF-EMF exposures were computed for 16 frequency bands between 88 MHz and 5.8 GHz. Of the 16 bands, the three highest sources of environmental RF-EMF exposures were: Global System for Mobile Communications (GSM) 900 MHz downlink (82 mV/m); Universal Mobile Telecommunications System (UMTS) 2100MHz downlink (51 mV/m); and GSM 900 MHz uplink (45 mV/m). Similarly, the three highest personal exposure sources were: GSM 900 MHz downlink (50 mV/m); UMTS 2100 MHz downlink, GSM 900 MHz uplink and GSM 1800 MHz downlink (20 mV/m); and Frequency Modulation radio, Wi-Fi 2.4 GHz and Digital Video Broadcasting-Terrestrial (10 mV/m). The median environmental exposures were: 179 mV/m (total all bands), 123 mV/m (total mobile phone base station downlinks), 46 mV/m (total mobile phone base station uplinks), and 16 mV/m (Wi-Fi 2.4 GHz). Similarly, the median personal exposures were: 81 mV/m (total all bands), 62 mV/m (total mobile phone base station downlinks), 21 mV/m (total mobile phone base station uplinks), and 9 mV/m (Wi-Fi 2.4 GHz). The measurements showed that environmental RF-EMF exposure levels exceeded the personal RF-EMF exposure levels at kindergartens. ncbi.nlm.nih.gov Excerpt In conclusion, this study provides evidence to support that of the 16 frequency bands measured the mobile phone base station DL exposure of GSM 900 MHz is the largest contributor to the total environmental and personal RF-EMF exposures in kindergartens in Melbourne. Wi-Fi exposure was found to be very low compared with mobile phone base station exposure. Environmental exposure levels at kindergartens located <300 m away from the nearest base station were higher compared with those located >300 m. The measurements suggested that the personal RF-EMF exposure levels were lower compared with the environmental RF-EMF levels at kindergartens.

AI evidence extraction

Main findings

In measurements across 16 bands (88 MHz–5.8 GHz), the largest contributors to both environmental and personal RF-EMF exposures in kindergartens were mobile phone base station signals, particularly GSM 900 MHz downlink. Median environmental exposures were reported as 179 mV/m (total all bands) and 16 mV/m (Wi‑Fi 2.4 GHz), while median personal exposures were 81 mV/m (total all bands) and 9 mV/m (Wi‑Fi 2.4 GHz); environmental levels exceeded personal levels, and kindergartens <300 m from a base station had higher environmental exposure than those >300 m.

Outcomes measured

• Environmental RF-EMF exposure levels (mV/m) across 16 frequency bands (88 MHz–5.8 GHz)
• Personal RF-EMF exposure levels (mV/m) across 16 frequency bands (88 MHz–5.8 GHz)
• Relative contributions of sources/bands (e.g., GSM 900 DL/UL, UMTS 2100 DL, Wi‑Fi 2.4 GHz)
• Comparison of exposures by distance to nearest base station (<300 m vs >300 m)

Limitations

• Small number of children (n=10) for personal measurements
• Study limited to kindergartens in Melbourne, Australia
• Abstract does not describe measurement duration/timing or other protocol details

Suggested hubs

• school-wi-fi (0.72)
  Reports measured Wi‑Fi 2.4 GHz exposure levels in kindergarten settings and compares them with other RF sources.

{
    "study_type": "exposure_assessment",
    "exposure": {
        "band": "RF",
        "source": "kindergarten environment and personal exposure; mobile phone base stations (GSM/UMTS) and Wi‑Fi",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": "Kindergarten children in Melbourne, Australia",
    "sample_size": 10,
    "outcomes": [
        "Environmental RF-EMF exposure levels (mV/m) across 16 frequency bands (88 MHz–5.8 GHz)",
        "Personal RF-EMF exposure levels (mV/m) across 16 frequency bands (88 MHz–5.8 GHz)",
        "Relative contributions of sources/bands (e.g., GSM 900 DL/UL, UMTS 2100 DL, Wi‑Fi 2.4 GHz)",
        "Comparison of exposures by distance to nearest base station (<300 m vs >300 m)"
    ],
    "main_findings": "In measurements across 16 bands (88 MHz–5.8 GHz), the largest contributors to both environmental and personal RF-EMF exposures in kindergartens were mobile phone base station signals, particularly GSM 900 MHz downlink. Median environmental exposures were reported as 179 mV/m (total all bands) and 16 mV/m (Wi‑Fi 2.4 GHz), while median personal exposures were 81 mV/m (total all bands) and 9 mV/m (Wi‑Fi 2.4 GHz); environmental levels exceeded personal levels, and kindergartens <300 m from a base station had higher environmental exposure than those >300 m.",
    "effect_direction": "unclear",
    "limitations": [
        "Small number of children (n=10) for personal measurements",
        "Study limited to kindergartens in Melbourne, Australia",
        "Abstract does not describe measurement duration/timing or other protocol details"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "RF-EMF",
        "radiofrequency",
        "exposure assessment",
        "kindergarten",
        "children",
        "GSM 900",
        "UMTS 2100",
        "Wi-Fi 2.4 GHz",
        "base station downlink",
        "uplink",
        "Melbourne"
    ],
    "suggested_hubs": [
        {
            "slug": "school-wi-fi",
            "weight": 0.7199999999999999733546474089962430298328399658203125,
            "reason": "Reports measured Wi‑Fi 2.4 GHz exposure levels in kindergarten settings and compares them with other RF sources."
        }
    ]
}

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