Human exposure to infrared heat provides little risk. Infrared heat consists of electromagnetic waves that are just below the visible spectrum. They have lower energy than both ultraviolet (UV) rays and light rays and are emitted by virtually all objects that give off heat.
Significance
Infrared heating has several applications. Humans are directly exposed to infrared waves in homes that have infrared heating systems (also called radiant heating), and many saunas now use infrared heating.
Misconceptions
It is a common misconception that because infrared waves are a type of radiation, they share the same health hazards as UV waves and X-rays. All electromagnetic waves are technically a form of radiation, however, including light and radio waves. All heated objects, except those with highly reflective surfaces, emit heat as infrared waves. Even the human body emits infrared radiation.
Theories/Speculation
A study published in "Dermatology Nursing" found that infrared waves emitted by the sun may actually help protect the skin against damage caused by its UV rays. The sun emits a higher infrared wave to UV wave ratio toward dawn and dusk when the UV index is low.
Tags: infrared waves, electromagnetic waves, infrared heating