06-03-2008, 04:33 PM
Electro magnetic radiation is a natural part of the environment. The kind we normally worry about is the high frequency types such as ultra violet and above (x-rays, gamma, etc.). But these others (such as the microwave frequecies used by many communications networks), even though they have a lower freqency than light, doesn't mean they're not dangerous over long time spans of exposure. What one should be careful of is introducing new frequencies that weren't present before in our natural evolution, in the quantities that we're talking about.