5G and small cell RF exposure
Last reviewed: 19 October 2026
5G is the first mobile generation to add new frequency bands in years, and "small cells" — compact antennas on lamp posts and street furniture — are its most visible hardware. This page collects what 5G transmits, the limits that apply to the new bands, what dated measurement surveys found at street level, and what the reviews conclude.
Typical levels and limits, with dated sources
- Most 5G deployments use frequency bands similar to 4G's (below 6 GHz); some networks add millimetre-wave bands (24 GHz and above), deployed so far mainly in North America and parts of Asia (ICNIRP, 2020; Ünsal & Yücel, Environmental Research, 2023).
- The ICNIRP 2020 guidelines were updated specifically to cover the new bands and protect against all established effects across 100 kHz–300 GHz: above 2 GHz the general-public reference level is 10 W/m², and at millimetre-wave frequencies the limits protect against surface heating, where energy is absorbed in the first fraction of a millimetre of skin rather than penetrating the body (ICNIRP, 2020).
- A WHO-commissioned systematic review of human studies found no association between radiofrequency exposure from mobile phone use and brain cancer (Karipidis et al., Environment International, 2024); systematic reviews of 5G research published so far report exposures from deployed networks far below international limits and no confirmed hazard, while noting that long-term data on the newest bands is still accumulating (Ünsal & Yücel, 2023).
- Regulator measurement surveys around 5G-enabled sites have found street-level power densities at small fractions of the general-public reference levels — Ofcom's UK survey measured maximum levels of about 1.5% of the ICNIRP general-public limit (Ofcom, 2020).
- IARC classified radiofrequency electromagnetic fields — covering the frequencies 5G uses — as "possibly carcinogenic" (Group 2B) in 2011, based on limited evidence (Baan et al., Lancet Oncology 12(7): 624–626, 2011; IARC Monographs Vol. 102).
How distance and placement change exposure
- RF power density falls with the square of distance from the antenna: doubling your distance from a small cell leaves roughly a quarter of it. Street furniture mounts keep the antenna metres above head height, and the field at ground level is far below what the same device produces directly in front of its panel.
- Small cells transmit at lower power than macro cell towers — their range is a street block, not a district — so the exposure near one is not "a tower on your corner" scaled down; it is a small transmitter a few metres overhead.
- A phone connecting to 5G is itself the closer source: the handset at your ear transmits orders of magnitude more power density at your body than a small cell delivers at the pavement below it. Distance and hands-free habits on the handset remain the levers that matter (WHO, Fact sheet No. 193, 2014).
Sources
- ICNIRP (2020), "Guidelines for limiting exposure to electromagnetic fields (100 kHz to 300 GHz)", Health Physics 118(5): 483–524.
- Karipidis K, et al. (2024), "The effect of exposure to radiofrequency fields on cancer risk in the general and working population", Environment International — WHO-commissioned systematic review.
- Ünsal A, Yücel E (2023), "5G mobile networks and health: A systematic review", Environmental Research.
- Ofcom (2020), measurements of electromagnetic field levels around mobile base stations including 5G sites, February 2020.
- Baan et al., IARC Working Group (2011), "Carcinogenicity of radiofrequency electromagnetic fields", The Lancet Oncology 12(7): 624–626; IARC Monographs Vol. 102.
- WHO (2014), "Electromagnetic fields and public health: mobile phones", Fact sheet No. 193, updated October 2014.
Educational information, not medical advice. Numbers above are limits and findings as stated by their dated sources; our calculator's output is a model-based estimate, not a measurement. No adverse health effects are confirmed below international limits, and research on long-term effects is ongoing — see About for our editorial position.