The mercury levels are not surpassing U.S. Environmental Protection Agency thresholds. But researchers want to determine if what they are seeing is a temporary trend or a trajectory that's only going to worsen.
Detroit Free Press, USA Today: Nation
Sat, 03/25/2017 - 4:49pm
The mercury levels are not surpassing U.S. Environmental Protection Agency thresholds. But researchers want to determine if what they are seeing is a temporary trend or a trajectory that's only going to worsen.