Smart meters measure the use of a product such as electricity and send usage information back to the supplier on a regular basis, according to the American Cancer Society. They emit the same kinds of radio waves — a type of electromagnetic radiation — as cell phones and Wi-Fi devices.
Concerns have been raised about the safety of smart meters due to the radiation. At very high levels, radio waves can heat up body tissues, according to the American Cancer Society, but the low levels of energy emitted by smart meters are not enough to raise body temperature and are further diluted by the distance they typically need to reach people through walls.
Little research exists about the safety of smart meters, because they are relatively new. Research does exist regarding the possible health effects of exposure to radio waves in general. and it suggests that such waves might produce biological effects in human cells, according to the American Cancer Society.