Waste in the United States recognized the environmental issue that landfills create, and has been creating bans on U.S. landfill. Although this may create more environmental stability in the United States, it has become a major environmental and health issue in the countries to which the electronic waste is being shipped. Waste in the United States As a nation, Americans generate more waste than any other nation in the world, officially with 4.4 pounds (2.0 kg) of municipal solid waste (MSW) per person per day, with another study estimating 7.1 pounds per capita per day. Fifty five percent of this waste is contributed as residential
Parts-per notation Parts-per notation In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are ppm (parts-per-million, ), ppb (parts-per-billion, ), ppt (parts-per-trillion, ) and ppq (parts-per-quadrillion, ). This notation is not part of the SI system and its meaning is ambiguous. Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water. The quantity “1 ppm”