These have been reviewed critically by the International Commission on Non-Ionizing Radiation Protection, which found no convincing evidence of a link between cell phone use and the occurrence of brain tumors.

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Mr Wechlin adds that, during charging time, people stay inside the buses - something he says is absolutely safe, as the strength of the magnetic field produced is within the limits recommended by the International Commission on non-ionizing radiation protection (ICNIRP).

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The type of radiation coming out of a cell phone is called non-ionizing.

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