These have been reviewed critically by the InternationalCommission on Non-Ionizing Radiation Protection, which found no convincing evidence of a link between cell phone use and the occurrence of brain tumors.
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 InternationalCommission on non-ionizing radiation protection (ICNIRP).
Previously, the commission held that the amount of radiation released from FDI warranted only a level 5 designation on the International Nuclear Event Scale (which runs from 1 to 7).