Does a wifi router emit radiation?

Yes, your wifi router emits radiation - but it's non-ionizing radiofrequency (RF) radiation, the same type emitted by FM radios, televisions, and baby monitors. According to the UK Health Security Agency (UKHSA), wifi signals are very low power, typically 0.1 watt (100 milliwatts), and operate at frequencies broadly similar to FM radio, TV, and mobile phones. At these power levels, wifi radiation is not in the same category as X-rays or gamma rays, which are ionizing and can damage DNA directly. Source: GOV.UK

Think of it like the difference between a warm light bulb and a welding torch. Both emit energy, but one can burn you, and the other just keeps the room lit. Your router is the light bulb.

What kind of radiation does a wifi router produce?

Wifi routers operate on the 2.4 GHz and 5 GHz frequency bands (and now 6 GHz, where permitted). This falls under radiofrequency electromagnetic fields (RF-EMF), which is a form of non-ionizing radiation. Non-ionizing means the energy isn't strong enough to knock electrons off atoms or break chemical bonds in your cells. Ionizing radiation - from sources like X-rays, CT scans, and nuclear material - can do that, which is why exposure to those is carefully limited.

Ireland's Environmental Protection Agency (EPA), referencing international measurements, notes that RF-EMF levels from wifi devices are very low and well below ICNIRP recommended exposure limits. Typical exposure indoors ranges between approximately 2 V/m at 1 metre and 5 V/m at half a metre from the router, compared to the ICNIRP recommended limit of 61 V/m for the 2.4 GHz and 5 GHz bands. Source: Environmental Protection Agency

That's roughly 10-30 times below the safety threshold, depending on your distance from the router.

What do WHO and IARC say about wifi radiation?

This is where nuance matters.

In 2011, the WHO's International Agency for Research on Cancer (IARC) classified radiofrequency electromagnetic fields as "possibly carcinogenic to humans" (Group 2B), based on limited evidence of an increased risk for glioma, a type of brain cancer, associated with wireless phone use. Source: ScienceDaily

That phrase - "possibly carcinogenic" - sounds alarming, but context is important. Group 2B is the weakest category that still indicates uncertainty worth monitoring. It doesn't mean "probably causes cancer" and it doesn't mean "known carcinogen." Group 2B also includes pickled vegetables, aloe vera whole-leaf extract, and about 250 other substances. Source: Homewellnessscience

It's also important to note that the IARC classification was primarily based on studies about mobile phone use (held against the head during calls), not wifi routers. The UKHSA study showed that time-averaged output power of wifi devices is generally lower than that of mobile phones, and exposure from wifi is likely to be lower than from mobile phones during voice calls because router antennas tend to be further away from the body during normal use. Source: GOV.UK

The WHO's overall assessment, shared by most public health agencies worldwide, is that there are no established health effects associated with exposure to RF emissions from wifi. Source: SEnvironmental Protection Agency

How does wifi radiation compare to other household devices?

Your wifi router emits considerably less RF energy than several devices you probably use daily without a second thought.

A mobile phone during an active voice call transmits at around 0.5-2 watts, and it sits directly against your head. Your router transmits at around 0.1 watts and sits across the room. Regulatory bodies like Ireland's ComReg require compliance with maximum transmit power of 100 mW at 2.4 GHz and 200 mW at 5 GHz for indoor devices, ensuring RF levels remain below ICNIRP limits. Source: Environmental Protection Agency

A microwave oven operates at roughly 1,000 watts of RF energy (though contained within its shielding). Your router, by comparison, operates at 100-200 milliwatts. That's roughly 5,000 to 10,000 times less power.

What does ICNIRP recommend?

The International Commission on Non-Ionizing Radiation Protection (ICNIRP) recommends limiting the Specific Absorption Rate (SAR) - the measure of how much RF energy the body absorbs - to avoid temperature rises in the body and head. Wifi routers operate far below these limits under normal usage conditions. Source: SICNIRP

In a 2018 statement, the US FDA noted that current safety limits include a 50-fold safety margin from observed effects of radiofrequency energy exposure. That's a significant buffer. Source: Wikipedia

The German Federal Office for Radiation Protection (BfS) notes that IARC's advisory group recommended re-evaluating RF-EMF classification with high priority in light of new evidence since 2011, and the WHO is currently funding systematic reviews on possible health effects. So the science isn't closed - it's actively being reviewed. Source: BfS

Practical steps if you're still concerned

You don't need to turn off your router or wrap it in aluminium foil. But if you want to reduce exposure as a precaution, these steps are reasonable and backed by general health agency guidance:

Place your router in a common area rather than a bedroom. Distance is the single biggest factor - RF energy drops rapidly with distance. At 2-3 metres away, exposure is already a small fraction of what it is at half a metre.

Turn off the router at night if nobody's using the internet. This isn't about safety - it's more about peace of mind and saving a small amount of electricity.

Don't place the router directly on a desk where you sit for 8 hours a day. A shelf across the room is fine.

The short version

Your wifi router does emit radiation, but it's non-ionizing RF radiation at power levels far below international safety limits set by ICNIRP and endorsed by the WHO. No established health effects have been linked to wifi exposure at these levels. The IARC Group 2B classification applies broadly to all radiofrequency fields and is based on limited evidence from mobile phone studies, not wifi routers specifically. If you're concerned, distance is your best tool - a few metres between you and the router reduces exposure significantly