Radio frequency electromagnetic fields are produced by wireless communication devices and broadcast signals. They range from about 3 kHz to 300 GHz and include frequencies used by cell phones, WiFi, Bluetooth, and 5G. RF is typically measured in microwatts per square meter (µW/m²) or milliwatts per square centimeter (mW/cm²).
Based on Building Biology Institute guidelines (µW/m² (microwatts per square meter)):
See where common exposures fall on the scale:
Showing 736 studies with measured radio frequency (rf) exposure
Wilbur P. Dayton · 1961
This 1961 technical report by Wilbur P. Dayton documented a comprehensive microwave radiation effects program, examining how radar and microwave frequencies impact biological systems. The research was conducted during the early years of radar technology deployment when understanding microwave health effects became critical for military and civilian safety protocols.
P. Jagadeesh, P.P. Newman, D.G.F. Harriman, D.H. Wilson · 1972
This 1972 study examined how pulsed electromagnetic fields affect nerve regeneration in rats. Researchers investigated whether non-thermal EMF exposure could influence how peripheral nerves heal and regrow after injury. This early research helped establish the foundation for understanding both therapeutic and potentially harmful effects of electromagnetic fields on nerve tissue.
John R. Frazier, Thomas R. Ohlhaber, Paul S. Ruggera · 1978
This 1978 government study examined how radiofrequency (RF) fields at environmental levels interfere with X-ray measurement instruments used in medical and industrial settings. The research investigated electromagnetic interference effects on critical radiation detection equipment. This work highlighted early concerns about RF pollution affecting sensitive medical devices.
Herbert Jonas · 1950
This 1950 thesis examined how very high radio frequency radiation affected the germination and metabolism of small seeds. The research investigated whether RF exposure could alter fundamental biological processes in plants during their most vulnerable developmental stage. This represents some of the earliest scientific investigation into how electromagnetic fields might impact living organisms.
F. G. Hirsch · 1956
This 1956 study by Hirsch explored using biological tissue samples to estimate microwave energy doses and predict potential tissue damage. The research focused on developing methods to measure how microwave radiation affects living tissue, including temperature changes and damage patterns. This early work helped establish fundamental approaches for understanding microwave exposure effects on biological systems.
S. A. CARNEY, J. C. LAWRENCE, C. R. RICKETTS · 1970
This 1970 study investigated how X-band microwaves affected guinea pig skin cells grown in laboratory tissue cultures, specifically examining changes in cellular respiration and biochemical processes. The research focused on pulsed microwave exposure rather than continuous radiation. This early work helped establish laboratory methods for studying how microwave radiation affects living tissue at the cellular level.
Unknown authors · 1970
This 1970 journal article examined non-ionizing radiation effects, covering microwave, infrared, and visible electromagnetic radiation. The research focused on thermal effects and cataractogenesis (cataract formation) from various EMF sources including lasers. This represents early scientific documentation of non-thermal biological effects from electromagnetic radiation.
S. J. Baum, W. D. Skidmore, M. E. Ekstrom · 1973
This 1973 technical report examined the effects of exposing laboratory rodents to 100 million pulses of electromagnetic radiation continuously. While specific findings aren't available from the abstract, this early research represents one of the first systematic attempts to study prolonged EMF exposure effects in living organisms. The study's focus on continuous, high-volume pulse exposure provides historical context for understanding how EMF research methodology has evolved.
Mason PA et al. · 2001
Researchers exposed mice to 94 GHz millimeter wave radiation (the same frequency range used in some 5G networks) to see if it would promote skin cancer development. Even at very high power levels - 1000 times stronger than typical exposure limits - the radiation showed no effect on tumor formation or growth. This suggests that millimeter wave radiation at these frequencies does not act as a cancer promoter in skin tissue.
Hardell L et al · 2018
Researchers measured radiofrequency radiation levels in a Stockholm apartment located near cell tower base stations on the roof. They found extremely high radiation levels averaging 3,811 µW/m², with some readings exceeding 112,000 µW/m² - levels the authors deemed unsafe for long-term living, especially for children.
Unknown authors · 1977
This 1977 technical report documented the development of a specialized device called the Mini-Surveyor for monitoring electromagnetic leakage from microwave sources, particularly at 2450 MHz frequency. The device featured a 30 decibel dynamic range, allowing it to detect and measure varying levels of microwave radiation emissions. This represents early recognition of the need to monitor and quantify microwave leakage in environments where such equipment was being used.