SERIES: MODERN VEHICLES AND THE HUMAN BODY · BLOG
What Nobody Tells You About EVs and EMF
The quietest cabin you have ever sat in is also, electromagnetically, the busiest — and almost no one is talking about the part that matters.
ARTICLE · joaquinmachado.com
J. Joaquín Machado L. · April 2026
We have been having the wrong argument
Every few months a headline reassures us that electric vehicles are "safe" when it comes to electromagnetic fields. The studies it cites are real, and I do not dispute them. But they are answering a question that stopped being the important one somewhere around the moment the car quietly stopped being a car.
The public conversation about EVs and EMF is stuck on the battery — the low-frequency magnetic fields of the pack, the motor, the inverter. Large surveys measure those fields and conclude, correctly, that taken on their own they sit within the accepted reference levels. Reassuring. And beside the point. Because the battery is the old electromagnetic story. The new one is sitting all around you, and it does not come from the thing that moves the car. It comes from the thing that makes the car modern.
Your car quietly became a robot
The real revolution of the last decade was not electrification. It was automation. On the road to self-driving, the modern vehicle grew a nervous system: arrays of cameras, short- and long-range radar, ultrasonic sensors, in some models LiDAR, ultra-wideband digital keys, native 5G, permanent connectivity, and — in the most advanced cabins — a radar aimed into the interior to watch the occupants. Your car became a rolling robot, and a robot has to sense the world continuously to act on it.
Sensing continuously means transmitting and receiving continuously. Depending on the vehicle, somewhere between fifteen and sixty radio functions are running at the same time, inside a small metal enclosure, with you in it, for the entire length of every trip. Not taking turns. Not pausing. By design.
That is the layer nobody names when they say "EVs are fine." It is not the drivetrain. It is the radiofrequency and microwave architecture of the automation itself — an infrastructure we welcomed into the cabin because it parks the car for us and keeps us in our lane, without ever asking what it means to sit inside it, day after day, year after year.
Why sitting *inside* it changes everything
The reasonable objection is that we are bathed in signals everywhere, and that a phone against your head is a stronger emitter than most of what is in a car. Both true. So why single out the cabin?
Three things make it different, and they are worth feeling rather than just reading. First, proximity: you are sitting centimeters to a meter from multiple emitters at once — the console, the screens, the key anchors, sometimes a radar pointed at you. Up close, the tidy physics of "it fades with distance" stops helping you. Second, continuity: a phone call ends; these systems run the whole journey, every journey. Third, the box itself: a metal cabin does not let those fields disperse — it reflects them back and layers them on top of one another, so you sit inside a standing composite of many overlapping sources.
And here is the finding that made me stop treating this as ordinary background. When I measured, the field did not just surround the occupants — it coupled into their bodies. A measurable voltage, induced on the person in the seat, rising during faster driving. You are not sitting next to the field. You are part of the circuit.
The paradox nobody wants to name
Sit with this for a moment, because it is the uncomfortable heart of the whole thing. We reached for the "clean" car — quiet, tailpipe-free, the symbol of a lighter footprint — and in the same motion we built the most electromagnetically active space most of us now occupy for hours a day. The cleaner and more modern the machine looks, the busier its cabin actually is.
And notice what the real variable turns out to be. It is not even "electric." A modern combustion SUV loaded with the same assistance systems and connectivity is, electromagnetically, closer to an electric vehicle than to an older car of its own brand. The organizing factor is not the fuel. It is the modernity — how automated, how connected, how sensor-dense the vehicle is. We have been arguing about the battery while the sensors did the talking.
The question we skipped
Here is what genuinely unsettles me, and it is not a claim that your car is making you ill. It is quieter and harder to dismiss than that: we adopted all of this without anyone ever measuring the cumulative exposure inside the cabin. Regulation, everywhere, checks devices one at a time — never the sum of everything running at once, and never the human being seated in the middle of it for an eight-hour day. The question of what chronic, near-field, multi-source exposure means over years was not answered and declared safe. It was simply never asked.
That silence should bother us more than any single measurement. And it should bother us most on behalf of the people who would feel it first if it mattered at all — the children strapped into the back seat, pregnant women, occupants with medical implants or genuine sensitivities. A precautionary instinct protects them first. We have instead defaulted them into an environment nobody characterized.
Why I am raising it — and where it goes next
I am not here to frighten anyone; alarm is the lazy move, and it closes conversations instead of opening them. I have spent years measuring real electromagnetic environments, and I carried my instruments into several Teslas and other modern vehicles because I wanted to see the thing itself rather than argue about it. What I want to do is move the spotlight — off the battery everyone debates and onto the radio layer nobody measures — and put a question on the table that the industry, the regulators, and honestly the rest of us have been content to skip.
This piece is only the surface of it. The full picture — the instrumental study of the Tesla Model Y with its 952 measured data points, the radiofrequency peaks that concentrate exactly where people sit, the body-voltage coupling, and the before-and-after of what happens when you actually treat the cabin — is laid out in detail in the whitepaper that opens this series: "The Car That Became a Robot." It is the long-form, evidenced version of everything gestured at here.
If reading this made you look at your own car a little differently — at the quiet, clean, modern machine you climb into every morning — then that is exactly the door I wanted to open. Read the whitepaper, and let us finally have the conversation nobody has been having.
— J. Joaquín Machado L. · www.joaquinmachado.com
This article is the public edition of Part 1 of the series "Modern Vehicles and the Human Body." The complete whitepaper, with the measurements and methodology, expands every finding introduced here.