- There is extremely strong evidence finding a relationship between ELF magnetic fields greater than 2 mG and childhood leukemia. This relationship has been a matter of scientific inquiry since 1979. Sixteen out of nineteen studies conducted since 1995 are now viewed as identifying a statistically significant relationship between magnetic fields greater than 2 to 4 mG and a two to four-fold increase in a child’s risk of contracting that disease.
- There is very strong evidence finding a relationship between maximum ELF magnetic field exposure greater than 16 mG and a 6-fold increase in miscarriages.
- There is strong evidence linking ELF magnetic fields and Alzheimer’s and Lou Gehrig’s disease (ALS).
- There is substantial evidence linking ELF magnetic fields greater than 12 mG and breast cancer and strong evidence linking magnetic fields and the suppression of the therapeutic effects of the anti-cancer drug, tamoxifin.
- Overall, there is limited evidence that magnetic fields cause childhood leukemia, and there is inadequate evidence that these magnetic fields cause other cancers in children.
- Studies of magnetic field exposure from power lines and electric blankets in adults show little evidence of an association with leukemia, brain tumors, or breast cancer.
- Past studies of occupational magnetic field exposure in adults showed very small increases in leukemia and brain tumors. However, more recent, well-conducted studies have shown inconsistent associations with leukemia, brain tumors, and breast cancer.
In Malaysia, the power transmission network is known as the National Grid and is managed by TNB. The voltage of the power lines are 132 kV, 275 kV and 500 kV. Distribution lines of 33 kV, 22 kV, 11 kV, 6.6 kV and 415/240 volt in the Malaysia distribution network connect to the National Grid via transmission substations where voltages are stepped down by transformers.
Health Risks Associated with Living Near High-Voltage Power Lines
- 10−9–10−8 gauss: the human brain magnetic field
- 0.31–0.58 gauss: the Earth's magnetic field on its surface
- 25 gauss: the Earth's magnetic field in its core
- 50 gauss: a typical refrigerator magnet
- 100 gauss: a small iron magnet
- 2000 gauss: a small neodymium-iron-boron (NIB) magnet
- 15,000-30,000 gauss: a medical magnetic resonance imaging electromagnet
- 1012–1013 gauss: the surface of a neutron star