Non-Ionizing Radiation From Wireless Technology

Radiation Facts

Wireless technology uses radiofrequency energy, which is a type of non-ionizing radiation.
Government agencies set safety guidelines that limit your exposure to radiofrequency energy.
Scientists continue to study the long-term health effects from exposure to low-levels of radiofrequency energy.

Radiofrequency (RF) energy is a type of electromagnetic radiation. It is used to transmit signals carrying information in the form of radio waves. Radio waves are broadcast using a transmitter. When the radio waves reach a receiver, the signal is converted back into the information that was originally sent by the transmitter. When you talk on a cell phone, your cell phone acts as a transmitter and your voice is carried on radio waves to the person you are calling. Their phone acts as the receiver and converts the signal back into your voice. In addition to cell phones, other wireless devices such as radios, Wi-Fi routers, satellites, radars and pacemakers can send or receive RF energy waves.

On this page:

About Non-Ionizing Radiation From Wireless Technology
What you can do
Where to learn more

About Non-Ionizing Radiation From Wireless Technology

Electronic devices that send information through the air are everywhere. Between Wi-Fi, cell phones and other networks, people are in a nearly constant cloud of wireless signals. These devices use RF energy to send and receive information.

RF energy is a type of non-ionizing radiation. Non-ionizing radiation is not strong enough to directly affect the structure of atoms or damage DNA; however, it does cause atoms to vibrate, which can cause them to heat up.

When RF energy is very strong, such as from radar transmitters, it can be dangerous. It can heat parts of your body very rapidly and cause serious injuries, like severe burns. These extremely high RF energy levels are only found near powerful equipment, such as long-distance transmitters. Radiofrequency energy decreases as it travels in atmosphere, which means that it gets weaker the farther it is from the transmitter. Powerful long-distance transmitters usually do not create high-level RF energy on the ground. If there is a ground level hazard from RF energy, there are safety requirements to prevent the public from dangerous exposure. Transmission towers that produce hazardous levels of RF have warning signs and security in place that limits access to only authorized personnel. These warnings and access restrictions should always be followed to keep you safe.

Cell phones and wireless networks also produce RF energy, but not at levels that cause significant heating. Some people are concerned about the potential health effects of RF energy from wireless technology. Most studies haven’t found any health effects from cell phone use. A few studies have connected RF and health effects, but scientists have not been able to repeat the outcomes. This means that they are inconclusive. Scientists continue to study the effects of long-term exposure to low-levels of RF energy.

Cell phone towers may broadcast higher levels of RF, so always remember to follow any warnings that limit access to the tower itself or the surrounding area.

What You Can Do

Scientists continue to study the effects of long-term exposure to low-levels of RF energy. If you are concerned, you can take these simple steps to reduce your exposure to RF energy:

Limit use. Reduce the number and length of your calls, or time spent using a wireless device.
Text instead. Texting uses a much smaller signal than a voice call, resulting in less exposure to RF energy.
Ensure good reception. If you have poor reception, some phones will boost their signal to try to make a better connection. If you are able, try to make calls in a location with good reception. This can reduce your RF exposure by avoiding signal boosts.
Increase distance. Add space between your wireless device and your body.

Where to Learn More

EPA does not regulate the non-ionizing radiation from wireless technology, and does not maintain expertise in this area. For more information, please visit the links below.

The U.S. Federal Communications Commission (FCC)

In the United States, the FCC sets safety guidelines that limit RF energy exposure. They license transmitters and facilities that generate RF energy. The FCC has adopted exposure limits for RF energy. All hand-held wireless devices sold in the United States must comply with these limits.

Radiation-emitting Products: Cell Phones
This webpage provides consumers with information about the FDA’s role in cell phone regulation and provides links to additional information.

Wireless Devices and Health Concerns
This webpage addresses FCC’s role in wireless device safety and provides research findings.

Specific Absorption Rate (SAR) for Cellular Telephones
This webpage discusses the Specific Absorption Rate (SAR) and provides cell phone manufacturer specific information. The Specific Absorption Rate is a measure of the amount of RF energy absorbed by the body when using a mobile phone.

The U.S. Department of Health and Human Services (HHS), the U.S. Food and Drug Administration (FDA)

The FDA works with the FCC to regulate wireless medical devices. The FDA can also act if wireless phones are found to emit levels of RF energy determined to be dangerous.

Wireless Medical Devices
This webpage discusses different ways that medical devices can use RF technology.

The World Health Organization (WHO)

The WHO studies EMF and RF and invites scientists from all over the world to collaborate on their research.

Electromagnetic fields and public health: mobile telephones and their base stations
This fact sheet provides information about the health effects from exposure to RF energy.

The U.S. Department of Homeland Security (DHS), the U.S. National Institutes of Health (NIH), the National Cancer Institute (NCI)

The National Cancer Institute (NCI) is the federal government's principal agency for cancer research and training.

Cell Phones and Cancer Risk
This webpage provides answers to commonly asked questions about cell phones and RF energy.

The Health Physics Society (HPS)

The HPS is a group of scientists that research and make recommendations about ionizing and non-ionizing radiation topics. They also produce informational reports, fact sheets, and websites to help people understand more about radiation. The Society is chartered in the United States as an independent nonprofit scientific organization, and is not affiliated with any government, industrial organization or private entity.

Mobile Telephone Fact sheet(PDF)(5 pp, 575 K, About PDF)
This fact sheet gives information on mobile telephone use and the electromagnetic spectrum.