European measurement
The European Union sets a limit of 2 W/kg averaged over 10 grams of tissue.
0.520 W/Kg on head
-- W/Kg on body
0.583 W/Kg on head
1.500 W/Kg on body
American measurement
The FCC limit is 1.6 W/kg measured in a volume of 1 gram of tissue
0.540 W/Kg on head
1.283 W/Kg on body
0.750 W/Kg on head
0.612 W/Kg on body