There is a growing concern with EMF radiation, and anything that can be done to reduce it seems worthwhile. Eliminating power harmonics is an important step to take.
There is a lot of information on the web about this issue, but the Green Home Institute for one offers classes about what can be done.
The State of Medical Research
It seems there is a risk of sensationalizing this information, so we got us some expert advice, in this case from Prof. David Savitz of the Institute at Brown for Environment & Society.
Here is the principal source he recommended:
Report on Electromagnetic Fields and Cancer from the National Cancer Institute.
There is also a Review of the Epidemiologic Literature on EMF and Health, published in Environmental Health Perspectives, Vol. 109, Supplement 6, December 2001, of which Professor Savitz was one of the authors.