Three principles: distance, time, source strength

If you only remember three things about EMF, remember these.

When health physicists, regulators, and the working groups at the FCC and ICNIRP write the rules that govern exposure limits, they are working from the same three variables. How far away you are. How long you are there. How strong the source is. That is it. Almost every practical decision about EMF in a home or office is a decision about one of these three things.

We use this frame for everything at BioHarmonize because it works. It cuts through the noise. It gives you something to do that is not "throw out your phone."

The short answer

Distance, time, and source strength are the three levers that decide how much EMF you absorb. You can pull one of them, two of them, or all three. You do not need to do all of them perfectly. Pulling any one of them in the right direction reduces exposure.

That is the entire framework.

Why these three

The physics is uncooperative if you do not know it, and very cooperative once you do.

Distance matters because the energy from a typical household EMF source falls off sharply as you move away from it. For sources that radiate in roughly a sphere, like a wifi router or a cellphone antenna, the intensity drops with the square of the distance. Doubling the distance from the source is not a 50 percent reduction. It is a 75 percent reduction. Tripling it is closer to 89 percent. Most household EMF problems are distance problems in disguise, which is to say they are solvable for free by moving something three or four feet.

Time matters because exposure is a dose, not an event. A single five-minute call against your ear is one thing. Eight hours of sleep with a phone on the pillow is another thing entirely. The FCC and ICNIRP both write their public exposure limits as time-averaged numbers. The longer you sit inside a field, the more dose you accumulate. This is why "where you sleep" comes up so often in our writing. You spend a third of your life there and you are typically motionless.

Source strength matters because not all signals are the same size. A laptop on airplane mode emits almost nothing. A laptop streaming a video over a strong wifi connection emits more. A wifi router under heavy load emits more again. A cellphone trying to reach a distant tower with one bar of service is working much harder than the same phone at full bars. Stronger sources put more energy into the space around them. You can often reduce source strength without removing the device, just by changing how it is configured.

These three variables interact. A weak source close to you can be the same effective dose as a strong source far away. A short exposure to a strong field can match a long exposure to a weak one. The exposure equation is not about any one number in isolation. It is the product of how far, how long, and how much.

Distance in practice

You will get the most leverage, fastest, by paying attention to distance.

The router in your bedroom is the classic case. Move it three feet and you have cut the field intensity by roughly three quarters before you have done anything else. Move it ten feet, into a hallway closet or the next room, and you are functionally outside the field for most uses. Same router. Same wifi. Different distance.

Other common distance fixes:

• The cellphone on the nightstand goes across the room while you sleep, or into another room entirely.
• The cordless phone base station moves off the desk and onto a shelf a few feet away.
• The wifi-enabled baby monitor, if you use one, is positioned across the nursery rather than next to the crib.
• The laptop you actually work on lives on a desk, not your body. The lap part of the name has not aged well.

None of these cost anything. None of them require giving up the device. They all use the inverse square nature of the field against itself.

Time in practice

Time is the lever you cannot game. You either spend hours in a field or you do not.

The two places where time exposure stacks up most for most people are the bedroom and the work desk. Together those are typically twelve to sixteen hours a day in the same physical space. If a strong source is in either of those places, you are getting the maximum possible time dose from it.

Working with time looks like:

• Treat the bedroom as a low-source zone. This is the highest-yield single change for the average household.
• Treat your primary work surface the same way. Wired headphones for long calls instead of bluetooth in your ear all day. Phone on the desk, not in your pocket, when you are sitting still.
• Be more relaxed about short, intentional exposures. A few minutes on a call is a different category from eight hours next to a sleeping head.

The bedroom matters out of proportion because it is the longest, most repetitive, most motionless exposure window in a typical week. It is also the place where the body is doing its repair work. That is why we keep coming back to it.

Source strength in practice

This is the lever most people do not know they have.

A lot of household EMF sources are configurable. Their strength is set by software, not hardware, and the defaults often skew higher than they need to be. A few examples worth knowing about:

• Most home wifi routers ship with transmit power set to maximum. Many of them have a setting in the admin panel to dial it down to half or a quarter. The signal still covers the house. The peak strength drops.
• 5GHz wifi has shorter range and falls off faster than 2.4GHz. Choosing the 5GHz band for nearby devices keeps the field more local.
• Bluetooth devices have power classes. The lowest class, common in modern earbuds, is much weaker than the older class used in some headsets.
• Cellphones boost their transmit power when signal is poor. A phone struggling for service in a basement is working harder, and emitting more, than the same phone at full bars near a window. Using wifi calling, or simply not making long calls in the worst-signal corner of the house, reduces source strength meaningfully.

You will not get every source. You will not need to. Knocking down the two or three biggest emitters in the rooms where you spend the most time is most of the work.

What science actually says

We are careful with this. Here is the honest read.

The FCC and ICNIRP set the public exposure limits used in most of the world. Those limits are designed primarily around heating effects, where high-intensity radiofrequency energy can warm tissue. At normal household intensities, this kind of heating does not happen. From a regulatory standpoint, typical home use of wifi, phones, and bluetooth is within the established safety limits.

The IARC, an arm of the World Health Organization, classified radiofrequency electromagnetic fields as "possibly carcinogenic to humans" (Group 2B) in 2011, based on limited evidence for an association with glioma in heavy mobile phone users. That category also includes things like pickled vegetables and aloe vera extract. It signals "we cannot rule it out," not "it definitely causes harm."

The NTP 2018 study, a long-running U.S. National Toxicology Program project, found "clear evidence" of malignant heart tumors in male rats exposed to very high levels of 2G and 3G radiofrequency radiation over their lifetimes. Critics noted that the exposure levels were much higher than typical human use and that female rats and mice did not show the same effect. Supporters pointed out that any clear evidence finding at all is worth taking seriously, given the scale of human exposure.

Reasonable scientists disagree about how to weigh all of this. The honest read is that low-level RF exposure is unlikely to be a major health hazard for most people at most doses, and is not nothing. Distance, time, and source strength are the three levers that move you in the right direction without requiring certainty either way. That is the BioHarmonize position. It has not changed.

How to think about the loud parts of the internet

You will find people online who say EMF is fine and you are being paranoid. You will find people who say EMF is killing you and your children. Both groups are confident and both are partly wrong.

The frame we use, and recommend, is this. If a behavior change is free and easy and based on the three principles, just do it. Moving a router three feet costs nothing and is solidly inside the physics. Sleeping with your phone on your nightstand instead of your pillow costs nothing and is solidly inside the physics. You do not need a scientific certainty to make a free choice.

When something costs real money or real convenience, ask harder questions. What is the actual exposure reduction. From what source. For how long. Is the price worth the effect size. We try to be honest about those tradeoffs in our own products and our writing about other people's products.

One free change worth making this week

Pick the room where you spend the most continuous time. For most readers, that is the bedroom. Find the closest active EMF source to your head when you are in that room. Move it three feet away.

That is it. One source, three feet, one room. It will take you ninety seconds.

Next week, if you want, do it again in a different room.

This is how BioHarmonize thinks about EMF. Not as a project. As a series of small, free, physics-backed adjustments to the spaces where you sleep, work, and live.

What is next

In the coming weeks of Field Notes we are going to take each of these principles and walk through specific rooms and devices. Wifi routers, phones at night, the kitchen, the home office, the car, travel. Same three levers. Different settings.

If you have a room or device you want us to write about, write back to this email and tell us. We read every reply.