About 15 years ago I helped my daughter with a science fair project. The title was "EMF: Higher in your home or near power lines?" We used a gaussmeter and took readings under power lines from 12 kv up to 500 kv. Most of these readings were from about 10 to 25 milligauss. The highest reading was inside a substation (I was a utility company substation engineer at the time) with the meter about 4 feet from a 115 kv bus. That was about 200 milligauss. In our house with the meter about one foot from an electric can opener we got about 2000 milligauss. Almost all electric appliances at home were substantially higher than anything I worked around. If you are convinced there is a risk, don't sleep under an electric blanket. That was about 80 mG, not very high but long exposure.

Ichabod