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aData from EPA, Compilation of Air Pollutant Emission Factors, AP-42, Fifth ed., U.S. Environmental Protection Agency, U.S. Government Printing Office, Washington, D.C., January 1995. Tons are short tons. To convert from lb/ton to kg/Mg, multiply by 0.5. To convert from lb/ton to lb/MM Btu, multiply by 0.0625. ND, no data; NA, not applicable. ^Subpart D boilers are boilers constructed after August 17, 1971, with a heat input rate greater than 250 million Btu per hour (MM Btu/hr). Subpart D(a) boilers are boilers constructed after September 18, 1978, with a heat input rate greater than 250 MM Btu/hr.

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