Answer
There is currently a good bit of debate around the effects of low levels of exposure to electromagnetic fields. This page and this page offer two different perspectives. To answer your specific question about cellular radio towers, here are a couple of things to keep in mind. First, cellular towers are transmitting at low power in order to limit their range (see the cellular phone page to understand why low power makes the cellular concept work). In other words, the power level from the tower is not much different from a CB radio. If worried about cellular radio waves, any potential danger would be much more worrisome for the users of the phones, where the transmitter is only inches from the head rather than hundreds of feet away

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