...However, in 2001, after reviewing all the relevant research, both the International Agency for Research on Cancer (IARC) and a UK expert group on non-ionising radiation concluded that exposure to prolonged and relatively high levels of magnetic fields may increase the risk of leukaemia in children.
Specifically, children with average daily exposures of more than 0.3 to 0.4 uT were found to have a leukaemia(=白血病) risk of 2 in 20,000 per year, whereas children with lower exposures had a risk of 1 in 20,000.
On the basis of the research findings, IARC classified magnetic fields as 'possibly carcinogenic', a classification shared with coffee, pickled vegetables, bitumen, engine exhaust and hundreds of other substances.