Frequencies above 30 Hz cover a very wide span of non-ionizing radiation: power-line and appliance fields (typically 50/60 Hz), intermediate frequencies, and radiofrequency (RF) fields used by radio, Wi-Fi, mobile phones, and 5G (roughly kHz to hundreds of GHz).
Mainstream health agencies treat these bands separately, and the current status is that causal contribution to disease at everyday exposure levels is not established.
Official classifications
The International Agency for Research on Cancer (IARC) has two relevant “possibly carcinogenic” (Group 2B) listings, which mean limited evidence, not a confirmed cause:
Extremely low-frequency magnetic fields (2002): limited human evidence for childhood leukemia at higher residential exposures (roughly above 0.3–0.4 µT daily average). No accepted mechanism, and experimental studies have not supported a causal link. Later reviews, including WHO and recent Swedish and European assessments, have not upgraded or withdrawn that classification; the association remains unresolved and unconfirmed as causal.
Radiofrequency fields (2011, ~30 kHz–300 GHz): limited human evidence for glioma and acoustic neuroma among heavy mobile-phone users, plus limited animal evidence. Evidence for other cancers was judged inadequate.
Group 2B is a weak category (it also includes things such as pickled vegetables). Ionizing radiation (X-rays, gamma rays), which can directly damage DNA, is classified far higher.
Recent evidence reviews
WHO-commissioned systematic reviews of human observational studies (published 2024–2025) are the most current large syntheses:
Mobile-phone RF exposure was not associated with higher risk of glioma, meningioma, acoustic neuroma, pituitary tumors, salivary-gland tumors, or pediatric brain tumors (pooled relative risks near 1.0). Certainty was rated moderate that it likely does not increase those risks.
Far-field exposure from base stations or broadcast antennas was judged likely not to increase childhood leukemia risk (moderate certainty).
Evidence for several other cancers was low or insufficient.
National bodies reach similar conclusions. The German Federal Office for Radiation Protection states that an association between mobile-phone fields and brain tumors is unlikely and that health effects below recommended limits are not scientifically proven. Australia’s ARPANSA, summarizing the WHO reviews, reports no substantiated evidence of health risks from low-level RF exposure in the general public or workers.
The U.S. National Cancer Institute and American Cancer Society note mixed older studies, no identified mechanism by which these fields damage DNA the way ionizing radiation does, and insufficient evidence that typical RF exposure causes tumors. Sweden’s radiation authority’s 2025 review found no new established causal relationships between EMF exposure and health risk.
The only effect of RF fields that is widely accepted as established is tissue heating at high intensities. Exposure guidelines (ICNIRP and similar national limits) are set to prevent that. Long-term effects below those limits have been studied extensively without a confirmed disease link.
Animal data are mixed. The U.S. National Toxicology Program saw some tumor signals in rats at high whole-body exposures; other studies have not reproduced a clear pattern at levels comparable to ordinary phone use. Some recent animal reviews report signals for certain tumors, but human epidemiology has not confirmed corresponding risks.
Awareness and disagreement
Public and regulatory awareness of the topic is high—driven by power lines, mobile phones, and 5G—but official public-health positions remain that disease causation at everyday levels is not established.
Electromagnetic hypersensitivity (symptoms attributed to EMF) is recognized as real distress; blinded provocation studies have not shown that the fields themselves cause the symptoms.
A minority of researchers and advocacy groups argue the Group 2B classifications understate risk, cite genotoxicity or reproductive findings in some lab studies, and question conflicts of interest around guideline bodies. IARC has listed RF fields as a priority for possible re-evaluation later in the decade. Those critiques have not shifted the consensus statements of WHO-linked reviews or major national radiation agencies.
In short: above 30 Hz, the standing IARC labels are “possible” for childhood leukemia (ELF magnetic fields) and for certain brain tumors (RF, based mainly on older heavy-use data). Large recent human reviews find no clear increase in those risks, and health authorities do not treat typical environmental or device exposures as an established cause of disease.
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