Electric Vehicles vs Petrol Vehicles: What We Found About EMF

Direct answer. Despite social media claims that electric vehicles (EVs) are "microwaves on wheels", our real-world testing and independent physics studies tell a different story. When tested at 60km/h, a standard diesel vehicle produced magnetic fields up to seven times higher (17–20 mG) than a modern EV (3 mG). Both sit well below the ARPANSA and ICNIRP safe exposure limits. In traditional cars, it's the alternator, metal chassis return paths, and magnetised steel-belted tyres that generate the bulk of the low-frequency magnetic fields at the driver's feet.

Table of Contents

1. Introduction: The "Microwave on Wheels" Myth
2. The Test: EV vs Petrol/Diesel — Australian Conditions
3. Comparison Table: EMF Sources in EVs vs ICE Vehicles
4. Why Do Petrol and Diesel Cars Emit Higher Fields?
5. How to Test Your Own Vehicle
6. Australian Standards & The Bottom Line
7. Frequently Asked Questions
8. Sources

Introduction: The "Microwave on Wheels" Myth

If you've spent any time on social media lately, you've probably come across the claim that electric vehicles are "microwaves on wheels," silently cooking occupants with dangerous radiation on every trip to the shops.

It's a catchy line. It's also physically inaccurate, and it's the sort of claim that spreads fast because it's easy to make and hard to check unless you actually pick up a proper meter and measure it yourself.

At Aus Security Products, we get asked about this constantly. So rather than speculate, we ran our own test — professional-grade EMF meter, Australian roads, Australian vehicles, four cars: two EVs and two petrol/diesel models. The results ran the opposite direction to what the viral posts claim.

The physics distinction that matters here:

Microwave ovens use Radio Frequency (RF) energy, a high-frequency form of electromagnetic radiation tuned specifically (around 2.45 GHz) to excite water molecules and generate heat. That's a completely different mechanism to what's happening under your car's bonnet.

Cars, electric and petrol alike, primarily generate Extremely Low Frequency (ELF) magnetic fields. These come from electric motors, alternators, wiring, and battery systems operating at much lower frequencies, roughly 50 Hz to a few kHz, occasionally reaching into the VLF range for EV inverters. ELF fields behave very differently to RF radiation: they don't heat tissue, they don't cook food, and they're the same broad category of field produced by household items like hair dryers, electric blankets, and kitchen appliances.

Calling an EV a "microwave on wheels" is a bit like calling a torch a "laser cannon" because they both produce light. Same broad category, wildly different mechanism and intensity.

Disclaimer: This content is for informational and educational purposes only. Exposure guidelines reference ICNIRP (2010) for ELF fields and ARPANSA-endorsed limits. We make no health claims.

The Test: EV vs Petrol/Diesel in the Real World — Australian Conditions

Rather than lean on manufacturer specs or overseas studies alone, we ran our own comparison using vehicles readily available on Australian roads.

Vehicles tested: - 2026 EV (BYD) - 2024 EV (Hyundai) - 2022 Petrol (Mitsubishi) - 2016 Diesel (Ford Ranger). All phones in the test vehicles were set to airplane mode to establish a clean baseline, particularly for the radio frequency (RF) readings.

Test conditions: - Speed: 60km/h (steady state, flat road — typical Australian suburban speed limit) - Measurement points: front driver's seat footwell, rear passenger footwell, above the battery location, and at the radio frequency band in the same positions - All phones on airplane mode for RF readings (clean baseline) - Instrument: Alpha Labs AC Milligauss Meter (Model UHS2, with NIST certificate)

We chose the Alpha Labs AC Milligauss Meter because it's a dedicated true 3-axis instrument, measuring AC magnetic fields from 13 Hz to 75 kHz with a resolution of 0.01 mG, far more precise than a general-purpose meter. It also comes with a NIST certificate, meaning its calibration is traceable to a national standard. That level of precision matters when you're comparing an EV (which relies on high-frequency switching electronics) against a combustion vehicle (which relies on lower-frequency electromechanical components like alternators).

Battery position also differed between the two EVs, and that shaped where we took readings. In the BYD, the battery pack sits under the centre of the car — spanning both the rear and front passenger footwells — so we measured both spots. In the Hyundai, the battery sits further forward, so we concentrated our readings near the front footwell, directly above where the pack is located.

The meter setting we used — and why it matters:

We ran the meter on its 3-Axis ELF + VLF setting, capturing the frequency range from roughly 13 Hz to 75 kHz. This range is deliberately wide, because it needs to catch two very different things:

1. Low-frequency wiring and alternator fields — the classic 50 Hz-ish fields generated by a car's electrical system and rotating engine components.
2. Higher-frequency inverter and DC-DC converter switching noise — the electronic "chatter" produced by an EV's power electronics as they step high-voltage battery current down to run onboard systems.

The UHS2 has three settings, and we used a second one to isolate the EV signature. Alongside the combined ELF + VLF reading, we also tested each vehicle on the 3-Axis VLF-only setting (1 kHz to 75 kHz), which targets EV and hybrid power electronics specifically. This setting ignores the normal 50/60 Hz fields from conventional wiring, so it often reads much lower on standard petrol or diesel cars. That makes it a useful diagnostic tool: if the ELF+VLF reading is high but the VLF-only reading is low, the source is most likely the alternator or low-frequency chassis wiring. If both readings are high, higher-frequency electronics — inverters, DC-DC converters — are likely contributing.

Had we only measured pure ELF (say, below 100 Hz), we could easily have missed the EV's inverter signature altogether. The combined ELF + VLF setting gave us a fair, apples-to-apples comparison across both drivetrain types.

The Alpha Labs UHS2 measuring inside an EV cabin — reading 0.08 mG on the 3-Axis ELF+VLF setting, well below typical background levels.

The results:

The electric fields were low across all four vehicles — nothing of note. RF readings were also low on both EVs and the Mitsubishi petrol, with all phones on airplane mode for a clean baseline.

The Ford Ranger was a different story entirely. It maxed out the meter's RF band repeatedly, at every measurement point, despite every phone in the vehicle being in airplane mode. It wasn't a one-off spike — it was consistent and repeatable across the footwell, rear seat, and battery-area readings. That points to the Ranger's own onboard systems as the source: likely candidates include additional antennas (common on utes fitted out for work or off-road use), aftermarket electronics such as UHF radios or driving light controllers, or RF noise from the engine management system itself. Whatever the exact source, it's a reminder that "microwave on wheels" fears are, if anything, pointed at the wrong vehicle type.

In plain terms, the "dangerous EV" narrative didn't hold up. The diesel ute's footwell reading came in nearly six to seven times higher than the EV's peak reading.

Comparison Table: EMF Sources in EVs vs ICE Vehicles

Why Do Petrol and Diesel Cars Emit Higher Fields?

This result catches people off guard, so let's walk through the two main things going on.

1. The alternator and chassis return path

In a petrol or diesel car, the alternator is constantly generating AC current to charge the battery and run the electrical systems. Here's the detail that matters: manufacturers save weight and cost by using the car's metal chassis as the return path for electrical current, instead of running a second dedicated wire back to the battery.

That means the "hot" wire carrying current out and the "return" path (the chassis itself) aren't sitting close together the way they would in a properly twisted or shielded cable. When a hot wire and its return path are separated like this, their magnetic fields don't cancel each other out efficiently. The result is an uncancelled AC magnetic field that radiates outward, and because the alternator and its wiring sit right behind the firewall, that field projects straight into the front footwell, right where your feet sit while driving.

EVs, by contrast, use heavily shielded, twisted-pair high-voltage cabling engineered specifically to prevent electromagnetic interference (EMI) with the vehicle's own sensitive electronics. That shielding is a design requirement rather than a health feature, but it has the side effect of containing stray magnetic fields far more effectively than a 1990s-style alternator wiring loom ever could.

2. Magnetised steel-belted tyres

Here's a detail almost nobody talks about: your tyres are magnetic, and this applies equally to EVs and petrol cars.

Most tyres contain steel belting for structural strength. During manufacturing and through normal use, this steel mesh can become permanently magnetised, picking up a residual magnetic charge much like a fridge magnet.

As the wheel rotates at speed, this magnetised steel belt sweeps past a fixed point (like the car's chassis or floor) many times per second, generating an alternating low-frequency magnetic field. Research measuring this effect (Milham et al., 1999) found fields of up to 2 microtesla (20 mG) near the floor of a moving vehicle, purely from tyre rotation, comparable to or even exceeding the fields generated by the vehicle's electrical system.

This is why both EVs and combustion cars showed some reading during our 60km/h test but almost nothing at idle. It's not just the drivetrain electronics — there are four rotating magnets attached to your car.

How to Test Your Own Vehicle

You don't need to take our word for it. Here's the process we used, simplified for a home test if you want to check your own car.

What you'll need: An Alpha Labs AC Milligauss Meter, or a TriField TF2 if you'd prefer an all-in-one that also reads electric fields and RF. Both will work for this test. You'll also need a safe, quiet stretch of road (or your driveway for the idle test).

Alpha Labs AC Milligauss Meter (UHS2) — the meter we used for this test

TriField TF2 — an all-in-one alternative that also reads electric fields and RF

1. Find a safe testing location. An empty car park or a quiet residential street works well for idle testing. For the driving test, use a straight, low-traffic road where you can safely maintain 60km/h.

2. Set the meter to 3-Axis ELF + VLF mode. This is the default mode on the Alpha Labs UHS2 (first knob position), covering 13 Hz to 75 kHz. This setting captures both traditional wiring fields and higher-frequency inverter noise, giving you the most complete picture.

3. Measure the footwell at idle. With the car parked and engine/motor running (or EV in "on" mode), hold the meter at foot level in the driver's seat. Note the reading.

4. Measure the same spot at 60km/h. With a passenger holding the meter safely (never test while driving unassisted), take the same footwell reading at a steady 60km/h. Compare the two numbers — you should see a noticeable increase, particularly in petrol/diesel vehicles.

5. Check above the battery or fuel tank. For EVs, this usually means the floor of the rear seats. For ICE vehicles, check near the fuel tank area for comparison.

Want a deeper walkthrough on reading the display and switching between modes? Our guide on how to use an EMF reader covers this in detail.

Australian Standards & The Bottom Line

It's worth putting these numbers in context. The ICNIRP (International Commission on Non-Ionizing Radiation Protection) sets the reference level for general public exposure to magnetic fields at 200 µT (2,000 mG) at 50 Hz (Australia's mains frequency). ARPANSA, Australia's radiation protection authority, endorses the ICNIRP guidelines for ELF exposure as consistent with scientific protection for the public.

Our highest reading, the diesel Ranger's 17–20 mG, is roughly 0.9–1% of that reference level. The EV's 3 mG reading is roughly 0.15%. Both vehicle types are operating at a tiny fraction of the established safety threshold.

The bottom line: if you're choosing between an EV and a petrol or diesel car, whether for Australian suburban streets, country roads, or the highway, base that decision on range, running costs, charging infrastructure, and personal preference, not on unfounded EMF fear-mongering. The data simply doesn't support the "microwaves on wheels" narrative, and if anything, our test on Australian roads suggests the opposite might be closer to the truth for footwell exposure.

If you're curious about reducing ambient EMF exposure at home — appliances, wiring, smart meters — our practical guide to magnetic field shielding covers sensible, non-alarmist approaches. And if you're specifically after RF exposure (the type actual microwaves and wireless devices produce), the Safe and Sound Pro II is built for that frequency range.

Frequently Asked Questions

Sources

• ICNIRP (2010). Guidelines for Limiting Exposure to Time-Varying Electric and Magnetic Fields (1 Hz to 100 kHz). Health Physics, 99(6):818-836.
• ARPANSA. Extremely Low Frequency (ELF) Electric and Magnetic Fields — endorses ICNIRP ELF guidelines. arpansa.gov.au
• Tell, R. A., et al. (2013). ELF magnetic fields in electric and gasoline-powered vehicles. Bioelectromagnetics, 34:156-161. — A 14-vehicle pilot study that found broadband magnetic field levels in EVs (geometric mean 0.095 µT) and gasoline vehicles (0.051 µT) were both well below ICNIRP exposure limits.
• Milham, S., et al. (1999). Magnetic fields from steel-belted radial tires: Implications for epidemiologic studies. Bioelectromagnetics, 20:440-445.