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Related Experiment Videos

ELF magnetic fields in a city environment.

M Lindgren1, M Gustavsson, Y Hamnerius

  • 1Department of Electromagnetics, Chalmers, Göteborg, Sweden. martin.lindgren@elmagn.chalmers.se

Bioelectromagnetics
|February 17, 2001
PubMed
Summary
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Extremely low frequency electromagnetic field (ELF-EMF) exposure, often overlooked outdoors, shows high levels in city environments. These elevated magnetic flux densities, similar to those linked to cancer risks, warrant inclusion in exposure assessments.

Area of Science:

  • Environmental Health
  • Public Health
  • Electromagnetic Fields

Background:

  • Epidemiological studies suggest a link between extremely low frequency electromagnetic field (ELF-EMF) exposure and cancer risks.
  • Previous research primarily focused on residential and occupational ELF-EMF exposure.
  • Outdoor environments are typically presumed to have low ELF-EMF levels.

Purpose of the Study:

  • To investigate ELF-EMF magnetic flux densities in urban outdoor environments.
  • To determine if city sidewalks present significant ELF-EMF exposure levels.
  • To assess the relevance of outdoor ELF-EMF exposure in risk evaluations.

Main Methods:

  • Mapping of ELF magnetic flux densities along selected city sidewalks.
  • Measurement of magnetic flux densities in central Göteborg City, Sweden.

Related Experiment Videos

  • Identification of sources contributing to elevated ELF-EMF levels.

    • Main Results:

    • Approximately 50% of the measured street length exhibited ELF magnetic flux densities of 0.2 microT and above.
    • These levels are comparable to those associated with increased cancer risks in epidemiological studies.
    • High magnetic flux densities (> 1.0 microT) were detected near electrical infrastructure and devices.

    Conclusions:

    • Urban outdoor environments can have significant ELF-EMF exposure levels.
    • Outdoor ELF-EMF exposure should be considered in comprehensive risk assessments and evaluations.
    • Elevated flux densities are likely caused by stray currents and proximity to electrical equipment.