Link between magnetic fields and leukaemia is weak

A Canadian study has shown higher rates of leukaemia among children who were exposed at an early age to electromagnetic fields in their homes than among those less exposed. But it does not show that these fields cause cancer, and a separate, US study concludes independently that the evidence for a causal relation is weak.

The Canadian study, carried out by researchers at the University of Toronto and the Hospital for Sick Children, Toronto, with partial funding from the Ontario …