Smart meter RF exposure
Last reviewed: 19 October 2026
A smart meter is a utility meter that reports readings over the air. Unlike a phone, it is not used face-to-face: it sits on an outside wall or meter board and transmits in short, infrequent bursts. This page collects what dated measurement studies found, the limits that apply, and how distance from the meter changes exposure.
Typical levels and limits, with dated sources
- Smart meters transmit duty-cycled: a measurement campaign on residential meters found transmission duty cycles around 1% or less, so time-averaged output is a small fraction of peak power (Tell, Sias & Vazquez, "Electromagnetic fields associated with smart meters", Radio Science Bulletin, 2012).
- The same study and a California state assessment concluded that RF levels around operating smart meters — including right at the meter face — remain well below the FCC exposure limits (Tell et al., 2012; California Council on Science and Technology, "Health Impacts of Radio Frequency Exposure from Smart Meters", 2011).
- The ICNIRP general-public reference levels across the bands smart meters use are frequency-dependent — f/200 W/m² between 400 MHz and 2 GHz (about 4.5 W/m² at 900 MHz) and 10 W/m² above 2 GHz (ICNIRP, 2020).
- IARC classified radiofrequency electromagnetic fields — the kind smart meters use — 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 meter's antenna: doubling the distance leaves roughly a quarter of it. A meter on the far side of an outside wall exposes someone inside far less than the same meter beside their bed.
- Because transmissions are bursts rather than continuous output, the time-averaged field near a meter is far below its peak reading — this is the "duty cycle" effect the measurement studies rely on (Tell et al., 2012).
- Building materials attenuate the signal; a meter enclosure and an exterior wall both sit between the antenna and the home's occupants in most installations.
Sources
- Tell RA, Sias GG, Vazquez A (2012), "Electromagnetic fields associated with smart meters", Radio Science Bulletin.
- California Council on Science and Technology (2011), "Health Impacts of Radio Frequency Exposure from Smart Meters", January 2011.
- ICNIRP (2020), "Guidelines for limiting exposure to electromagnetic fields (100 kHz to 300 GHz)", Health Physics 118(5): 483–524.
- FCC (1997), "Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields", OET Bulletin 65.
- Baan et al., IARC Working Group (2011), "Carcinogenicity of radiofrequency electromagnetic fields", The Lancet Oncology 12(7): 624–626; IARC Monographs Vol. 102.
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.