NUMBER 1 HAZARD TO CHILDREN, according to the EPA. Lead can be found in old paints, dusts, solder, soils, and in fluoridated water. Although the use of lead in U.S. gasoline declined since 1985, other sources inject about 2 billion kilograms of lead into the atmosphere in this country each year. An estimated 1.7 million children in the United States have unacceptably high levels of lead in their blood. National Institute of Health & (Source: 1998 Cornell Study). According to the NRC, "the pandemic scale of lead contamination... has increased lead concentrations throughout the Northern Hemisphere by a factor of at least 10." The northern half of the planet now has at least 10 times as much lead in soil and water as it had before the arrival of Europeans in North America. Source: Rachel's # 541.