EMF & environmental exposure
What is known, and what is contested.
Electromagnetic fields are everywhere modern life is: phones, routers, power lines, the wiring inside the walls. Some of what is said about them is settled physics. Some is genuinely unresolved. And some is asserted with a confidence the research does not support, in both directions. This page keeps those three apart, and sets the rest of the home environment alongside them, because that is where most of the evidence actually sits.
Written for anyone who has an ordinary practical question about their home and has been handed a side to pick instead of an answer.
Best evidenced
Indoor air, light and noise. Not electromagnetic at all.
Genuinely unresolved
Radiofrequency from everyday devices, in either direction.
Not supported
Harmonisers, pendants and plug-in protection devices.
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Mobile, 1080 x 1350 portrait, JPEG q75 under 300KB. Same scene as 06a, recomposed vertically rather than cropped from the landscape file.
01 · The problem
Two loud answers, and nothing in between.
Ask whether the wireless in your home matters and you tend to get one of two replies. That there is nothing to discuss and the question itself is silly. Or that exposure explains a long list of symptoms and the evidence is being kept quiet. Both arrive with total confidence, and neither leaves room for an ordinary question.
The questions people actually have are practical. Does it matter where the router sits. Is a wired connection worth the bother. Which parts of my home environment deserve attention, and which do not. Those deserve an answer rather than a side.
Who is writing this
We started with the same question.
We came at this with the same practical question you have, and got the same two unhelpful answers. So we went and read the research instead, including the parts that did not suit either camp.
We are not doctors and we do not pretend to be. What we can do is separate what has been tested in people from what has been tested in a dish, say how large and how long the studies were, and tell you plainly where the evidence stops. Where something is genuinely unresolved, we say so rather than picking a side.
How this works
Discover. Understand. Explore. Choose.
The same four steps on every page of this site, in that order. You are somewhere in the middle of them right now.
01
Discover
Find out the question is more interesting than you were told.
02
Understand
See what the evidence supports, and where it runs out.
03
Explore
Ask the person who sent you here to walk you through it.
04
Choose
Decide for yourself, with no pressure and no deadline.
02 · Why it matters
You cannot sense it, so you cannot judge it.
Most environmental exposure offers no feedback. You cannot see indoor air quality, you cannot feel a radiofrequency field, and the effects that are established build slowly rather than announcing themselves. With no signal to react to, the decisions get made by default: whatever the builder installed, wherever the socket happened to be, whatever the phone does overnight.
That is precisely why the subject attracts strong claims. When people cannot verify something for themselves, they have to trust someone, and confidence is easier to sell than uncertainty. The useful response is not to pick a camp. It is to know which parts have been measured, which have not, and where your attention is actually worth spending.
03 · What the evidence says
Three exposures, three different weights of evidence.
Established
Indoor air, light and noise
The best evidenced exposures in a home are not electromagnetic at all. Indoor air quality, particularly combustion from cooking and heating, damp and poor ventilation, has been studied for decades. So has light at night and its effect on circadian timing, and long term noise. This is where the research is strongest and where attention is usually weakest.
Mixed
Radiofrequency from everyday devices
Phones, routers and cordless devices emit radiofrequency fields. International exposure limits are set well below the level at which tissue heating occurs, which is the effect that is properly understood. In 2011 the International Agency for Research on Cancer placed radiofrequency fields in its possibly carcinogenic category, a classification that signals limited evidence rather than demonstrated harm. Large studies since have not closed the question in either direction.
Often overstated
Harmonisers and protection devices
Pendants, stickers and plug-in devices sold to neutralise or harmonise fields. There is no accepted mechanism by which most of them could work, and independent testing has not supported the claims made for them. Some shielding materials do measurably reduce a field, but reducing a field is not the same as changing how a person feels, and it is at that second step that the evidence runs out.
This is an area of active research. Some of the studies referenced here are early, small, or conducted in laboratory or animal models rather than in people. We have said so wherever that is the case.
04 · The options
Our everyday environments involve many different exposures. These are three routes where practical changes may reduce unnecessary exposure and create a more considered home or workplace, set out in rough order of how much evidence sits behind them. The third is the one most often skipped, which is finding out what is actually there before changing anything.
The everyday environment
Opening a window while cooking, dealing with damp properly, a darker bedroom, a quieter one. Unglamorous and cheap, and the part of the home environment with the most research behind it.
What it will not do: explain symptoms that have another cause.
Distance and defaults
Field strength falls away sharply with distance, so where the router sits and whether the phone spends the night on the pillow are the variables that genuinely change exposure. Choosing a wired connection where it is convenient is a reasonable precaution rather than a proven benefit, and it is more honest to call it that.
What it will not do: remove exposure, or act as a treatment for anything.
Measurement first
Meters for fields, monitors for indoor air, a look at what your own home actually contains rather than what it is assumed to contain. Often the answer is undramatic, and occasionally it points at something worth fixing that nobody was discussing.
What it will not do: tell you whether a reading is the reason you feel unwell.
05 · The limits
Where this page stops.
Some people report headaches, disturbed sleep, skin symptoms or difficulty concentrating and attribute them to electromagnetic exposure. Those symptoms are real and they can be seriously disruptive. Studies that have tested whether people can detect fields under blinded conditions have generally not found that they can, which tells us something about the trigger and nothing at all about whether the person is unwell. Both of those things can be true at once, and we would rather say so than flatten it into a verdict.
What we would say is this. Symptoms that persist deserve a proper medical assessment, because several of the possible causes are treatable and settling on one explanation early is how those get missed. That is a reason to see a doctor, not a judgement about what you are experiencing.
Nothing described on this page treats, prevents or cures any condition, and no device sold anywhere changes that. A page about the home environment that never tells you where its own subject stops is selling something.
What is at stake
Attention spent where it counts, or where it does not.
If you understand it
You can make a few cheap, sensible changes to your home, ignore the rest with a clear conscience, and explain to someone else why you did.
If you do not
Money on devices that do nothing, worry about the wrong exposure, and the things that are genuinely well evidenced left unattended for another decade.
Keep reading
There is no rush, and nothing to sign up for.
If this was useful, these three are the natural next reads. Everything is free and nothing asks for your name.
Talk to your consultant to learn more.
The information on this page is for education only. It is not medical advice, and it is not a diagnosis or a treatment. Always speak to your doctor before changing anything about your care, and never stop prescribed medication without medical guidance.