The research was conducted in Mexico City, where more than 5% of children were exposed to ELF-MF levels above 0.3 microtesla (?T), higher than the global average for exposure, the report stated. The study measured magnetic field exposure in children's bedrooms and found that residential exposure above 0.4 ?T was significantly associated with an increased risk of developing CNS tumors, according to the EHN report.
Researchers followed 200 children diagnosed with such tumors and compared them to nearly 800 healthy children, measuring ELF-MF radiation levels in their homes. [2] The findings add to a body of peer-reviewed research that has accumulated since the late 1970s on the relationship between power-frequency electromagnetic fields and childhood cancer [4].
Study Findings and Exposure Sources
The researchers reported that prolonged use of a digital tablet – both with and without an internet connection – also increased CNS tumor risk, particularly in children ages 6 to 10, according to the EHN report. ELF-MF sources identified in the research included power lines and electrical grid infrastructure such as substations, as well as everyday electronics like laptops, tablets and their charging systems, the report stated.
According to the EHN report, everyday exposure to electromagnetic radiation from power lines, electrical grid infrastructure and household electronics is steadily increasing in the modern world. The report noted that while the public has some awareness that homes near high-voltage power lines create EMF exposure, fewer people are aware that electronics like tablets, laptops and phones also create EMF exposures in the body, especially when they are charging.
Scientific and Regulatory Context
The International Agency for Research on Cancer (IARC) of the World Health Organization (WHO) classified ELF-EMF magnetic fields as a possible human carcinogen in 2001, based largely on evidence linking residential exposure of 0.3 to 0.4 ?T to childhood leukemia, according to the EHN report. More recent studies continue to show the association, the report stated.
Kaiser Permanente studies reported that prenatal ELF-EMF exposure was associated with increased miscarriage risk and also ADHD, obesity and asthma in children, according to the EHN report. A review found that industry-funded studies more often reported "no effect," and that when this bias was accounted for, strong evidence linked EMF magnetic field exposure to adult leukemia, brain, and breast cancer, the report stated.
The WHO's risk assessment process has identified gaps in knowledge about the health effects of ELF field exposure and has called on government and industry to monitor science and promote research programs to further reduce the uncertainty of the scientific evidence, according to the BioInitiative report compiled by Cindy Sage [4]. Since the seminal work of Wertheimer and Leeper in 1979, many epidemiological studies of childhood cancer and residential exposure to power-frequency EMFs have been published, and while these studies make up an impressive body of evidence, there is ongoing discussion about whether the observed relationships can be causally interpreted, the BioInitiative report stated [4].
National Policies and Exposure Reduction
Many countries limit ELF-MF exposure in homes and schools due to associations with childhood cancer, according to the EHN report. The Netherlands, as an example, is buying up homes with elevated levels from power lines and substations, the report stated. However, the U.S. has no federal safety limits, as the Environmental Protection Agency was defunded from EMF research in the 1990s, according to the report.
On an individual level, the EHN report listed several steps that can reduce daily exposures: relocating beds away from electrical panels; using tablets and laptops on tables rather than on laps; charging phones and devices outside the bedroom rather than by the bed; not using a cell phone while it is charging; and unplugging water beds and electric blankets before getting in bed. Individuals can also measure the levels in their home with a basic milligauss meter to understand the EMF levels present, the report stated.
The BioInitiative report recommended that government and industry monitor science and promote research programs to reduce uncertainty about ELF field exposure, and that member states establish effective and open communication programs with all stakeholders to enable informed decision-making [4]. Research on electric heating blankets, pads, and mattresses has found that because the patient is in close vicinity to the wiring, local exposure to magnetic fields can be relevant, though it decreases rapidly with increasing distance and varies considerably depending on the placement of heating wires, according to research published in the book "Electromagnetic Fields in Biological Systems" by James C. Lin [5].
Conclusion and Public Action
From a policy perspective, individuals can contact school boards, planning commissions, and utility regulators to request EMF measurements and advocate for risk mitigation siting policies for new schools, childcare centers and residential developments, according to the EHN report.
References
- Environmental Health Sciences Staff. "Electromagnetic radiation from power lines linked to a higher risk of central nervous system tumors in children". EHN.org. September 25, 2026.
- V. Correa?Correa, J.C. Núñez?Enríquez et al. "Extremely low-frequency magnetic fields (ELF-MF) and radiofrequency: Risk of childhood CNS tumors in a city with elevated ELF-MF exposure". Environmental Research. doi.org/10.1016/j.envres.2025.122858.
- NaturalNews.com. "Study Links Childhood Exposure to Low Frequency Magnetic Fields with Increased Brain Tumor Risk". NaturalNews.com. March 21, 2026.
- Cindy Sage. "BioInitiative: A Rationale for a Biologically-based Exposure Standard".
- James C. Lin. "Electromagnetic Fields in Biological Systems".
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