“The analysis presented here supports a whole-body SAR limit of 2 to 4 mW/Kg for adults, an exposure level that is 20- to 40-fold lower than the legally permissible limit of 0.08 W/Kg for whole-body SAR under the current U.S. regulations. A ten-fold lower level of 0.2–0.4 mW/Kg whole-body SAR may be appropriate for young children.”
Check out this short video of Uloma Uche, the first author of the paper, making the case for stricter exposure limits for wireless radiation.
To learn more about benchmark dose analysis, see this 2012 EPA report.