No adverse health effect has been causally linked to 5G or other wireless technologies, according to the World Health Organization. Radiofrequency exposure levels from current networks result in negligible temperature rise in the human body, and as long as exposure stays below international safety guidelines, no public health consequences are anticipated. That said, the science is more nuanced than a simple “safe” or “dangerous” verdict, especially when it comes to environmental effects on plants and insects.
How 5G Frequencies Differ From 4G
5G operates across two main frequency ranges. The first, called FR1, covers frequencies up to 7.125 GHz. Many of these bands overlap with what 4G already uses, so a large portion of 5G radiation is physically identical to what cell networks have been emitting for over a decade. The second range, FR2, spans 24.25 GHz to 71 GHz. These higher “millimeter wave” frequencies are what’s genuinely new, and they behave differently: they carry more data but penetrate skin and other materials far less deeply than lower frequencies.
This distinction matters because most health concerns center on millimeter waves, yet most 5G networks people actually connect to run on FR1 bands that are nearly indistinguishable from 4G in terms of radiation characteristics.
What RF Energy Does to the Human Body
The primary way radiofrequency fields interact with your body is by generating heat. International safety guidelines from ICNIRP set limits designed to prevent tissue temperature from rising more than 2°C in the head and torso, and 5°C in the limbs, for frequencies below 6 GHz. Above 6 GHz, limits are set for all body surface tissues. Real-world exposure from cell towers and phones falls far below these thresholds.
The FCC limits public exposure from cell phones to a specific absorption rate of 1.6 watts per kilogram. These limits were established with built-in safety margins, reducing allowable exposure by factors of 2 to 10 below the levels where adverse effects begin. In practice, standing near a 5G small cell equipped with modern beamforming antennas exposes you to about five times less radiation than what a nearby active user receives, and even that user’s exposure remains well within safety limits.
Non-Thermal Effects and Cancer Concerns
The more contested question is whether radiofrequency fields can affect cells through mechanisms other than heating. Some laboratory research has reported that prolonged or repeated RF exposure can influence cellular physiology, particularly through oxidative stress, calcium signaling, and changes in gene expression. These findings come from controlled cell studies, though, and the exposures involved don’t always reflect what people experience from real networks.
Interestingly, one recent cell study found that 5G-range frequencies (both 3.5 GHz and 28 GHz) actually helped skin cells recover from UV-induced DNA damage, reducing markers of DNA breakage by 30 to 50 percent and suppressing harmful reactive oxygen species by 56 to 93 percent. The protective effect was comparable to that of a standard antioxidant treatment. This doesn’t mean 5G is therapeutic, but it illustrates that the biological picture is complex and doesn’t point uniformly toward harm.
The International Agency for Research on Cancer classifies all radiofrequency electromagnetic fields (not just 5G) as “possibly carcinogenic to humans,” a Group 2B designation. That’s the same category as pickled vegetables and aloe vera extract. It means the evidence is limited, not that a clear cancer risk has been established.
Effects on Insects
Environmental effects deserve more scrutiny than they typically receive. A study published in Nature’s Scientific Reports modeled how four types of insects absorb radiofrequency energy across frequencies from 2 to 120 GHz. The results were striking: all insects showed a general increase in absorbed power at and above 6 GHz compared to lower frequencies. This happens because at higher frequencies, the wavelength becomes comparable to an insect’s body size, allowing the energy to penetrate more effectively.
The researchers calculated that shifting just 10 percent of transmitted power to frequencies above 6 GHz could increase absorbed power in insects by 3 to 370 percent, depending on the species and frequency. Since heating affects insect behavior, physiology, and body structure, this raises legitimate questions about pollinator health and ecosystem impacts as millimeter wave networks expand. It’s worth noting that this study modeled power absorption, not population-level harm in the wild, so the real-world significance remains uncertain.
Effects on Plants
Plants appear sensitive to radiofrequency exposure even at low, non-thermal power levels. A comprehensive review in BioMed Research International documented a wide range of responses across dozens of plant species exposed to frequencies between 900 MHz and 10.5 GHz. Growth reductions were consistent and sometimes dramatic: mung bean seedlings exposed to 900 MHz signals showed 50 percent germination inhibition, 46 percent shorter stems, 59 percent shorter roots, and 43 percent less dry weight. Corn plants exposed to 1 GHz for eight hours grew roughly 50 percent less than unexposed controls. Radish seeds exposed to 10.5 GHz showed 45 percent germination inhibition.
At the cellular level, oxidative stress markers in exposed plants increased two- to five-fold. Protein content dropped substantially in some species, falling 71 percent in common beans and 57 percent in mung beans. Gene expression changed too, with stress-response genes ramping up three- to four-fold. Plants also released more terpene compounds, volatile chemicals often associated with stress responses, when exposed to frequencies between 900 and 2,400 MHz.
These studies used controlled laboratory conditions, and most involved frequencies already in use with 4G, not the higher millimeter wave bands unique to 5G. How these findings translate to real agricultural or forest environments, where signal strength drops rapidly with distance, remains an open question.
Energy Consumption and Carbon Footprint
One environmental concern that often gets overlooked is energy use. Transferring one gigabyte of data over 5G consumes about 0.501 kilowatt-hours, compared to 0.117 kilowatt-hours over 4G. That makes 5G roughly four times less energy-efficient per gigabyte. The tradeoff is that 5G handles far more data and connected devices simultaneously, which proponents argue improves overall network efficiency at scale. But as 5G infrastructure expands with dense networks of small cells, the aggregate energy demand and associated carbon emissions will grow, particularly if renewable energy sources don’t keep pace.
What the Evidence Adds Up To
For human health, the weight of evidence supports the position that 5G networks operating within current safety limits do not cause harm. The frequencies are non-ionizing, real-world exposures fall well below thresholds for tissue heating, and no causal link to disease has been established despite decades of research on radiofrequency fields broadly. The “possibly carcinogenic” classification reflects scientific caution about gaps in long-term data, not a confirmed risk.
The environmental picture is less settled. Laboratory studies show measurable biological effects on plants and insects at power levels and frequencies already in common use, and the shift toward higher frequencies could amplify energy absorption in small organisms. Whether these effects translate into meaningful ecological harm under real-world conditions is something current research hasn’t answered. The energy cost of 5G infrastructure adds another layer of environmental consideration that will depend heavily on how networks are powered as they expand.