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^Standards are given in mg/m3 corrected to standard conditions (6% O2, standard temperature and pressure—0° C (273 K), 101.3 kPa—on dry flue gas); when converting from lb/million Btu to mg/m3, dry flue gas volume is assumed to be 350 m3/GJ (based on gross heat value); note that ranges exist because emission standards may vary according to plant type, size, location, construction/commissioning date, boiler configuration, and type of coal used. ^Federal standards only; state standards may be more stringent. Source: McConville, A., An Overview of Air Pollution Emission Standards for Coal-Fired Plants Worldwide (Coal and Slurry Technology Association, Washington, D.C., 1997), pp. 1-12.

^Standards are given in mg/m3 corrected to standard conditions (6% O2, standard temperature and pressure—0° C (273 K), 101.3 kPa—on dry flue gas); when converting from lb/million Btu to mg/m3, dry flue gas volume is assumed to be 350 m3/GJ (based on gross heat value); note that ranges exist because emission standards may vary according to plant type, size, location, construction/commissioning date, boiler configuration, and type of coal used. ^Federal standards only; state standards may be more stringent. Source: McConville, A., An Overview of Air Pollution Emission Standards for Coal-Fired Plants Worldwide (Coal and Slurry Technology Association, Washington, D.C., 1997), pp. 1-12.

aspects of the U.S. federal regulation in that it assigns to member states the responsibility to implement the limit values and all attainment programs. In response to the directive, the EC proposed an ambient air quality standard of 0.05 mg/m3 for elemental mercury. The proposed standard is rarely exceeded in Europe. The United States and Japan do not have such a standard. The United States has regulated all significant sources of mercury emissions in a manner consistent with the United Nations protocol with the exception of power plant emissions. As discussed earlier, however, regulations are still forthcoming. The European Union also has not regulated mercury emissions from power plants.

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