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Nonionizing Radiation Levels in the Washington, D.C., Area

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Smith SW, Brown DG · 1973

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1969 Washington D.C. peak EMF levels were 1,000x below safety standards - today's smartphone generates similar power densities against your body.

Plain English Summary

Summary written for general audiences

Researchers measured radio frequency and microwave radiation levels across Washington D.C. in 1969, testing frequencies from 20 Hz to 10 GHz at ten urban locations. The highest radiation levels came from AM radio towers and airport radar, reaching about 0.01 milliwatts per square centimeter. These peak measurements were still 1,000 times lower than occupational safety standards of that era.

Why This Matters

This 1969 baseline study reveals how dramatically our EMF environment has changed in just five decades. The researchers found peak radiation levels of 0.01 mW/cm² primarily from AM broadcast towers and airport radar - sources that dominated the urban electromagnetic landscape before cell phones, WiFi, and wireless networks existed. What's striking is that even these 'highest levels' were 30 dB (1,000 times) below occupational exposure guidelines of the time.

Today's reality looks vastly different. Your smartphone alone can generate power densities approaching these 1969 peak levels during calls, while you carry it inches from your body for hours daily. The cumulative exposure from WiFi routers, cell towers, Bluetooth devices, and smart home technology creates a constant electromagnetic background that simply didn't exist when this study was conducted. This research serves as a sobering reminder of how rapidly and completely we've transformed our electromagnetic environment.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Smith SW, Brown DG (1973). Nonionizing Radiation Levels in the Washington, D.C., Area.
Show BibTeX
@article{nonionizing_radiation_levels_in_the_washington_d_c_area_g6439,
  author = {Smith SW and Brown DG},
  title = {Nonionizing Radiation Levels in the Washington, D.C., Area},
  year = {1973},
  
  
}

Quick Questions About This Study

Peak power density reached approximately 0.01 milliwatts per square centimeter (10^-2 mW/cm²), primarily from AM broadcast towers and airport radar installations across ten measurement sites within 25 miles of the city.
AM broadcast towers and airport radar installations generated the highest electromagnetic radiation levels. These were the dominant man-made EMF sources in the urban environment before cell phones and wireless networks existed.
The highest measured levels were 30 decibels (1,000 times) below published U.S. occupational exposure recommendations of that era, indicating relatively low electromagnetic radiation in the pre-wireless urban environment.
Researchers monitored electromagnetic radiation from 20 Hz to 10 GHz, covering extremely low frequencies through microwave ranges. This broad spectrum captured most man-made electromagnetic sources in the urban environment.
Experimental accuracy was estimated at ±10 decibels, meaning actual radiation levels could have been 3-10 times higher or lower than recorded values at the ten measurement sites around Washington D.C.