Maryland newborns and children each year. Mercury Pollution in Maryland presents an analysis of data from nearly 2,000 fish tested by state agencies; 59 percent of the fish contained enough mercury to present a potential health risk. Though Maryland has already established limits on mercury pollution from coal-fired power plants and banned mercury-containing thermostats, the state must do more to protect citizens from mercury by ending medical and municipal waste incineration and collecting mercury-based products.