Study Spotlight: Living Near Power Lines Linked to 54% Higher Alzheimer’s Death Risk in Massive Swiss Study

High-voltage power lines crossing through a residential area

A new study following 3.5 million Swiss adults for 18 years has found that long-term residential exposure to magnetic fields from high-voltage power lines is associated with significantly higher mortality from Alzheimer’s disease and other dementias. The hazard ratio for Alzheimer’s was 1.54 per 1 µT increase — meaning a 54% higher risk of dying from Alzheimer’s for each microtesla of additional magnetic field exposure.

Published in Environment International (2026), this is one of the largest population-based studies ever conducted on power line magnetic fields and neurodegenerative disease.

The Study at a Glance

Detail	Value
Citation	Röösli et al., Environment International, 2026
PMID	41691953
Study type	Prospective cohort (population-based)
Population	3,555,064 adults from the Swiss National Cohort
Follow-up	18 years (2001–2018)
Person-years	55.4 million
Deaths from neurodegenerative disease	146,655
Exposure sources	High-voltage power lines (50 Hz) + railway lines (16.7 Hz)
Key finding	HR 1.54 for Alzheimer’s per 1 µT from power lines

What They Did

The researchers used the Swiss National Cohort — a linkage of census data covering virtually the entire adult population of Switzerland. They modeled magnetic field exposure from two sources:

High-voltage power lines (HVPL) at 50 Hz — the standard European frequency
Railway lines at 16.7 Hz — Switzerland’s extensive rail network uses a lower frequency

Exposure was calculated using validated proximity models and updated over four time intervals (2001–2005, 2006–2010, 2011–2015, 2016–2018). Each person’s exposure was averaged over a 10-year moving window preceding each interval — capturing genuinely long-term chronic exposure, not just a snapshot.

They then used Cox proportional hazards models to estimate the risk of dying from five neurodegenerative diseases: Alzheimer’s disease (AD), other dementias (OTD), amyotrophic lateral sclerosis (ALS), Parkinson’s disease (PD), and multiple sclerosis (MS).

Models were adjusted for age, sex, education, neighborhood socioeconomic status, urbanization, air pollution (PM2.5, NO₂), traffic noise, and greenspace — a thorough set of confounders.

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What They Found

Power Lines (50 Hz)

The headline results for high-voltage power line exposure:

Disease	Hazard Ratio per 1 µT	95% Confidence Interval	Significant?
Alzheimer’s disease	1.54	1.23–1.92	✅ Yes
Other dementias	1.31	1.13–1.52	✅ Yes
ALS	~1.0	Crossing 1.0	❌ No
Parkinson’s disease	~1.0	Crossing 1.0	❌ No
Multiple sclerosis	~1.0	Crossing 1.0	❌ No

The association was specific to dementia — no increased risk for ALS, Parkinson’s, or MS. This specificity actually strengthens the finding, because a general “sick building” or confounding effect would be expected to increase risk across all diseases.

Railway Lines (16.7 Hz)

Railway exposure showed weaker associations that largely attenuated after adjusting for environmental co-exposures (air pollution, noise). This suggests that for railways, confounding from traffic-related exposures may explain some of the initial signal.

Exposure Context

Less than 1% of the Swiss population had long-term power line exposure ≥0.3 µT — the threshold often used in epidemiological studies. About 2.4% had comparable railway exposure. This means the findings are driven by a relatively small but measurable fraction of the population living close to high-voltage infrastructure.

Why This Study Matters

1. Unprecedented Scale

With 3.5 million people and 55 million person-years of follow-up, this dwarfs previous studies on EMF and neurodegeneration. The 146,655 neurodegenerative deaths provide enormous statistical power — enough to detect modest effect sizes with precision.

2. Long-Term Exposure Assessment

Most previous studies used a single time-point estimate of exposure. This study modeled exposure over 10-year windows, updated across four periods. Neurodegenerative diseases develop over decades, so long-term cumulative exposure is far more relevant than a snapshot.

3. Novel Railway Exposure Analysis

No previous population-based study had examined railway magnetic fields (16.7 Hz) alongside power lines (50 Hz). The different results for the two frequencies provide useful mechanistic clues — though the authors note railway exposure is harder to separate from co-occurring pollution and noise.

4. Robust Confounding Control

The Swiss National Cohort provides exceptionally detailed sociodemographic data. Adjusting for PM2.5, NO₂, traffic noise, greenspace, education, and neighborhood deprivation goes well beyond most EMF epidemiological studies.

How This Fits the Bigger Picture

This study doesn’t exist in isolation. Here’s how it connects to the broader evidence:

Supporting evidence:

A 2017 meta-analysis of occupational ELF-EMF exposure found a pooled relative risk of approximately 1.3–1.5 for Alzheimer’s disease in electrical workers — similar magnitude to this residential finding
The EUROPAEM EMF Guideline 2016 (PMID 27454111) identified occupational ELF exposure as a potential Alzheimer’s risk factor
Our EMF and dementia guide covers the broader mechanistic evidence, including amyloid-beta interactions and microtubule effects

The therapeutic paradox: Intriguingly, electromagnetic fields are also being investigated as an Alzheimer’s treatment. Transcranial electromagnetic treatment (TEMT) at radiofrequency has shown amyloid plaque reduction and memory improvement in animal models. This mirrors the pattern we see across EMF research — dose, frequency, duration, and exposure pattern all matter enormously.

Counter-evidence:

The study found no association for ALS, Parkinson’s, or MS — diseases where some prior studies suggested links
Railway exposure associations attenuated with better confounding control — a cautionary note about residual confounding
The authors themselves state: “Causal inference remains limited by the absence of established biological mechanisms”

What This Means for You

If you live near high-voltage power lines:

This study adds to — but doesn’t definitively resolve — the evidence on power line health effects. Combined with the childhood leukemia data, it reinforces a precautionary approach:

Know your exposure. Use our Power Line EMF Calculator to estimate magnetic field levels at your distance from nearby lines. Fields drop dramatically with distance.
Distance is your best protection. The study used 10-year exposure windows. Chronic proximity (living within ~100m of high-voltage lines for years) is the concern, not brief exposures.
Bedroom placement matters most. You spend ~8 hours sleeping. If power lines are nearby, optimizing your bedroom for the lowest exposure makes the most sense.
Measure, don’t guess. A gaussmeter ($30–$300) gives you objective data about your actual exposure. Field strength varies dramatically with electrical load, time of day, and line configuration. See our EMF meters guide for recommendations.
Perspective on absolute risk. Even a 54% relative increase in risk doesn’t mean a 54% chance of getting Alzheimer’s. It means if your baseline risk were, say, 10%, it would rise to about 15.4%. Genetics, exercise, social engagement, diet, and sleep quality remain far larger risk factors.

If you’re house hunting:

Our power lines near your house guide and EMF home inspection checklist provide practical frameworks. Check your address on our interactive map to see nearby power infrastructure.

Our Assessment

Classification: ⚠️ Concerning — with important caveats

This is one of the strongest epidemiological studies linking residential power line exposure to neurodegenerative disease. The scale (3.5 million people), duration (18 years), exposure modeling (10-year rolling windows), and confounding control all represent best-in-class methodology.

The specificity for dementia (not ALS, PD, or MS) and the dose-response relationship strengthen the case. But the absence of a proven biological mechanism, the potential for residual confounding (even with extensive adjustment), and the inconsistency with some prior studies mean this doesn’t close the debate.

What it does do: it makes the precautionary recommendation to maintain distance from high-voltage power lines — especially for long-term residence — more evidence-based than ever.

Frequently Asked Questions

How far from power lines do you need to be to avoid increased risk?

The study modeled exposure using validated distance-based models. Magnetic fields from high-voltage power lines typically drop below 0.3 µT (the commonly used epidemiological threshold) at distances of 100–200 meters, depending on line voltage and electrical load. Use our Power Line EMF Calculator for site-specific estimates.

Does this prove power lines cause Alzheimer’s?

No. This is an observational study showing an association, not proven causation. The authors note that “causal inference remains limited by the absence of established biological mechanisms.” However, the consistency with prior occupational studies, the dose-response pattern, and the disease specificity make the association harder to dismiss as pure coincidence.

What about living near railway lines?

The study found weaker associations for railway exposure (16.7 Hz) that largely disappeared after adjusting for air pollution and traffic noise. This suggests railway proximity health effects may be driven more by co-occurring environmental exposures than by the magnetic fields themselves.

Are distribution lines (wooden poles on streets) a concern?

This study focused on high-voltage transmission lines, which generate significantly stronger magnetic fields than local distribution lines. Distribution lines on wooden poles typically produce fields well below 0.3 µT at residential distances. Transmission lines (large metal towers, 69kV–765kV) are the primary concern.

How does this compare to the childhood leukemia evidence?

Both lines of evidence point in the same direction — chronic residential exposure to elevated magnetic fields is associated with increased disease risk. The childhood leukemia association (approximately doubled risk above 0.3–0.4 µT) has been consistent across decades of research. This dementia finding adds a second major disease endpoint with similar exposure thresholds.

I’ve lived near power lines for years. Should I move?

That’s a personal decision that depends on many factors. This study shows population-level associations, not individual certainties. Steps you can take without moving: measure your actual exposure, optimize your bedroom placement for lowest fields, and focus on modifiable dementia risk factors (exercise, sleep, social engagement, diet) that have much larger effect sizes.

Study: Living Near Power Lines Linked to 54% Higher…