Testing with a TriField meter led Brian Collins of Encinitas, Calif., to sell his 2001 Honda Insight just six months after he bought it — at a loss of $7,000. He said the driver was receiving “dangerously high” E.M.F. levels of up to 135 milligauss at the hip and up to 100 milligauss at the upper torso. These figures contrasted sharply with results from his Volkswagen van, which measured one to two milligauss.
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A spokesman for Honda, Chris Martin, points to the lack of a federally mandated standard for E.M.F.’s in cars. Despite this, he said, Honda takes the matter seriously. “All our tests had results that were well below the commission’s standard,” Mr. Martin said, referring to the European guidelines. And he cautions about the use of hand-held test equipment. “People have a valid concern, but they’re measuring radiation using the wrong devices,” he said.

Kent Shadwick, controller of purchasing services for the York Catholic District School Board in York, Ontario, evaluated the Toyota Prius for fleet use. Mr. Shadwick said it was tested at various speeds, and under hard braking and rapid acceleration, using a professional-quality gauss meter.

“The results that we saw were quite concerning,” he said. “We saw high levels in the vehicle for both the driver and left rear passenger, which has prompted us to explore shielding options and to consider advocating testing of different makes and models of hybrid vehicles.”

In a statement, Toyota said: “The measured electromagnetic fields inside and outside of Toyota hybrid vehicles in the 50 to 60 hertz range are at the same low levels as conventional gasoline vehicles. Therefore there are no additional health risks to drivers, passengers or bystanders.”

The statement adds that the measured E.M.F. in a Prius is 1/300th of the European guideline.

The tests conducted by hybrid owners rarely approach the level of thoroughness of those run by automakers.
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Lawrence Gust of Ventura, Calif., a consultant with a specialty in E.M.F.’s and electrical sensitivity, was one of the electrical engineers who tested Mr. Collins’s Insight in 2001. He agreed that the readings were high but did not want to speculate on whether they were harmful. “There are big blocks of high-amp power being moved around in a hybrid, the equivalent of horsepower,” he said. “I get a lot of clients who ask if they should buy hybrid electric cars, and I say the jury is still out.”