The cumulative findings of epidemiologists have been gained despite the inability to test a suspected carcinogenic agent in controlled, randomized studies.
Radiation is often highly publicized as a source of cancer development.
Electromagnetic radiation of the above two types are significantly below levels needed to ionize biological molecules and cause mutations resulting in cancer. The risk of low levels radiation may be overestimated, however. Chemicals , many of which have been historically linked to the workplace, have been successfully limited through public health efforts, because they have been associated with a variety of cancers. Pollution has been difficult to document as a contributor to human cancer. Last updated Thursday, February 22, 2001.