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Indoor transformer stations and ELF magnetic field exposure: use of transformer structural characteristics to improve exposure assessment

Abstract

Previous studies have shown that populations of multiapartment buildings with indoor transformer stations may serve as a basis for improved epidemiological studies on the relationship between childhood leukaemia and extremely-low-frequency (ELF) magnetic fields (MFs). This study investigated whether classification based on structural characteristics of the transformer stations would improve ELF MF exposure assessment. The data included MF measurements in apartments directly above transformer stations (“exposed” apartments) in 30 buildings in Finland, and reference apartments in the same buildings. Transformer structural characteristics (type and location of low-voltage conductors) were used to classify exposed apartments into high-exposure (HE) and intermediate-exposure (IE) categories. An exposure gradient was observed: both the time-average MF and time above a threshold (0.4 μT) were highest in the HE apartments and lowest in the reference apartments, showing a statistically significant trend. The differences between HE and IE apartments, however, were not statistically significant. A simulation exercise showed that the three-category classification did not perform better than a two-category classification (exposed and reference apartments) in detecting the existence of an increased risk. However, data on the structural characteristics of transformers is potentially useful for evaluating exposure–response relationship.

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References

  1. IARC. Non-ionizing radiation, Part 1: static and extremely low-frequency (ELF) electric and magnetic fields. IARC Monogr Eval Carcinog Risks Hum 2002; 80: 1–395.

    Google Scholar 

  2. Ahlbom A, Day N, Feychting M, Roman E, Skinner J, Dockerty J et al. A pooled analysis of magnetic fields and childhood leukaemia. Br J Cancer 2000; 83: 692–698.

    Article  CAS  Google Scholar 

  3. Greenland S, Sheppard AR, Kaune WT, Poole C, Kelsh M . A pooled analysis of magnetic fields, wire codes, and childhood leukemia. Epidemiology 2000; 11: 624–634.

    Article  CAS  Google Scholar 

  4. Juutilainen J, Kumlin T, Naarala J . Do extremely low frequency magnetic fields enhance the effects of environmental carcinogens? A meta-analysis of experimental studies. Int J Radiat Biol 2006; 82: 1–12.

    Article  CAS  Google Scholar 

  5. Luukkonen J, Liimatainen A, Höytö A, Juutilainen J, Naarala J . Pre-exposure to 50 Hz magnetic fields modifies menadione-induced genotoxic effects in human SH-SY5Y neuroblastoma cells. PLoS One 2011; 6: e18021.

    Article  CAS  Google Scholar 

  6. Draper G, Vincent T, Kroll ME, Swanson J . Childhood cancer in relation to distance from high voltage power lines in England and Wales: a case-control study. BMJ 2005; 330: 1290–1292A.

    Article  Google Scholar 

  7. Kabuto M, Nitta H, Yamamoto S, Yamaguchi N, Akiba S, Honda Y et al. Childhood leukemia and magnetic fields in Japan: a case-control study of childhood leukemia and residential power-frequency magnetic fields in Japan. Int J Cancer 2006; 119: 643–650.

    Article  CAS  Google Scholar 

  8. Mezei G, Kheifets L . Selection bias and its implications for case-control studies: a case study of magnetic field exposure and childhood leukaemia. Int J Epidemiol 2006; 35: 397–406.

    Article  Google Scholar 

  9. Li CY, Mezei G, Sung FC, Silva M, Chen PC, Lee PC et al. Survey of residential extremely-low-frequency magnetic field exposure among children in Taiwan. Environ Int 2007; 33: 233–238.

    Article  Google Scholar 

  10. Ilonen K, Markkanen A, Mezei G, Juutilainen J . Indoor transformer stations as predictors of residential ELF magnetic field exposure. Bioelectromagnetics 2008; 29: 213–218.

    Article  CAS  Google Scholar 

  11. Thuróczy G, Jánossy G, Nagy N, Bakos J, Szabó J, Mezei G . Exposure to 50 Hz magnetic field in apartment buildings with built-in transformer stations in Hungary. Radiat Prot Dosimetry 2008; 131: 469–473.

    Article  Google Scholar 

  12. Hareuveny R, Kandel S, Yitzhak NM, Kheifets L, Mezei G . Exposure to 50 Hz magnetic fields in apartment buildings with indoor transformer stations in Israel. J Expo Sci Environ Epidemiol 2011; 21: 365–371.

    Article  Google Scholar 

  13. Röösli M, Jenni D, Kheifets L, Mezei G . Extremely low frequency magnetic field measurements in buildings with transformer stations in Switzerland. Sci Total Environ 2011; 409: 3364–3369.

    Article  Google Scholar 

  14. Huss A, Goris K, Vermeulen R, Kromhout H . Does apartment’s distance to an in-built transformer room predict magnetic field exposure levels? J Expo Sci Environ Epidemiol 2013; 23: 554–558.

    Article  Google Scholar 

  15. Keikko T, Seesvuori R, Hyvönen M, Valkealahti S . Public magnetic field exposure based on internal current density for electric low voltage systems. Health Phys 2009; 96: 423–431.

    Article  CAS  Google Scholar 

  16. Energiateollisuus. Kiinteistömuuntamoiden aiheuttamat magneettikentät. Final report of the TransCat project (in Finnish). Energiateollisuus (Finnish Energy Industries): Helsinki, Finland. 2007.

  17. Hämäläinen M . Low frequency magnetic fields and indoor transformer stations. MSc thesis (in Finnish). University of Kuopio: Kuopio, Finland. 2002.

  18. Eskelinen T, Keinänen J, Salonen H, Juutilainen J . Use of spot measurements for assessing residential ELF magnetic field exposure: a validity study. Bioelectromagnetics 2002; 23: 173–176.

    Article  Google Scholar 

  19. Juutilainen J, Hatfield T, Läärä E . Evaluating alternative exposure indices in epidemiological studies on extremely low-frequency magnetic fields. Bioelectromagnetics 1996; 17: 138–143.

    Article  CAS  Google Scholar 

  20. Auvinen A, Linet MS, Hatch EE, Kleinerman RA, Robison LL, Kaune WT et al. Extremely low-frequency magnetic fields and childhood acute lymphoblastic leukemia: an exploratory analysis of alternative exposure metrics. Am J Epidemiol 2000; 152: 20–31.

    Article  CAS  Google Scholar 

  21. Eskelinen T, Niiranen J, Juutilainen J . Use of short-term measurements for assessing temporal variability of residential ELF magnetic field exposure. J Expo Anal Environ Epidemiol 2003; 13: 372–377.

    Article  Google Scholar 

  22. Juutilainen J, Läärä E, Saali K . Relationship between field-strength and abnormal development in chick-embryos exposed to 50 Hz magnetic fields. Int J Radiat Biol 1987; 52: 787–793.

    CAS  Google Scholar 

  23. Farrell JM, Barber M, Krause D, Litovitz TA . Effects of low frequency electromagnetic fields on the activity of ornithine decarboxylase in developing chicken embryos. Bioelectrochem Bioenerg 1997; 43: 91–96.

    Article  CAS  Google Scholar 

  24. Kheifets L, Ahlbom A, Crespi CM, Draper G, Hagihara J, Lowenthal RM et al. Pooled analysis of recent studies on magnetic fields and childhood leukaemia. Br J Cancer 2010; 103: 1128–1135.

    Article  CAS  Google Scholar 

  25. Kheifets L, Afifi A, Monroe J, Swanson J . Exploring exposure—response for magnetic fields and childhood leukemia. J Expo Sci Environ Epidemiol 2011; 21: 625–633.

    Article  Google Scholar 

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Acknowledgements

We thank Electric Power Research Institute for financial support and Mr. Kimmo Ilonen for collecting the measurement data.

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Correspondence to Jukka Juutilainen.

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The authors declare no conflict of interest.

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Okokon, E., Roivainen, P., Kheifets, L. et al. Indoor transformer stations and ELF magnetic field exposure: use of transformer structural characteristics to improve exposure assessment. J Expo Sci Environ Epidemiol 24, 100–104 (2014). https://doi.org/10.1038/jes.2013.54

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