There are news stories today that the Danish Government is paying compensation to women who have developed breast cancer after long spells working nights.
This is because shift work or work at night has been classified by the International Agency for Research on Cancer (IARC) as "probably" a cause of cancer. When IARC used the same classification scheme to look at EMFs, they classified magnetic fields as "possibly" a cause, one category lower in their scheme (and electric fields were even lower). The chief difference is the animal evidence - the evidence from humans was judged to be about the same strength in both cases ("limited"), but there was strong evidence for light at night or related factors causing cancer in rodents, whereas the evidence from animals for EMFs is "inadequate".
More details on shift work and how the evidence compares to EMFs.
