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Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.

Reproductive Health

The relationship between residential proximity to extremely low frequency power transmission lines and adverse birth outcomes

No Effects Found

Authors not listed · 2010

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Living within 400 meters of power transmission lines shows no association with adverse birth outcomes.

Plain English Summary

Summary written for general audiences

Researchers examined birth records from over 700,000 babies in Montreal and Quebec to determine if living within 400 meters of power transmission lines affected pregnancy outcomes. They found no association between proximity to transmission lines and preterm birth, low birth weight, or infant sex, and actually found a slight reduction in small-for-gestational-age births at certain distances.

Why This Matters

This large-scale study provides reassuring evidence that living near power transmission lines doesn't increase birth risks. The science demonstrates that extremely low frequency EMF from transmission lines, while creating stronger fields than typical household sources, doesn't translate to measurable harm during pregnancy. What's particularly noteworthy is the study's robust methodology - tracking over 700,000 births across 15 years while controlling for socioeconomic factors that often confound EMF research. The finding of slightly fewer small-for-gestational-age births near transmission lines likely reflects unmeasured socioeconomic variables rather than protective EMF effects. This research adds to the growing body of evidence that power line EMF, while worth monitoring, poses minimal risk to human reproduction compared to other environmental factors.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's ELF exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: ELFCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2010). The relationship between residential proximity to extremely low frequency power transmission lines and adverse birth outcomes.
Show BibTeX
@article{the_relationship_between_residential_proximity_to_extremely_low_frequency_power_transmission_lines_and_adverse_birth_outcomes_ce1366,
  author = {Unknown},
  title = {The relationship between residential proximity to extremely low frequency power transmission lines and adverse birth outcomes},
  year = {2010},
  doi = {10.1136/jech.2009.097709},
  
}
DOI: 10.1136/jech.2009.097709PubMed: 20628083

Quick Questions About This Study

This study of over 700,000 births found no association between living within 400 meters of transmission lines and preterm birth, low birth weight, or infant sex. Proximity to power lines did not increase adverse pregnancy outcomes.
The study examined distances up to 400 meters from transmission lines and found no harmful effects at any distance. Even mothers living within 50-75 meters showed no increased risk of adverse birth outcomes.
No, the research found no increased risk of small-for-gestational-age births near transmission lines. In fact, some distance categories showed slightly lower rates, though this likely reflects other unmeasured factors rather than protective effects.
The 15-year Quebec study found transmission lines caused no birth defects or adverse outcomes. Researchers tracked preterm birth, low birth weight, and small-for-gestational-age births with no increased risks at any distance from power lines.
Yes, the Montreal-Quebec study tracking births from 1990-2004 found no safety concerns for pregnant women living near transmission lines. Over 700,000 births showed no pattern of increased adverse outcomes with proximity to power lines.