Table A26

Emission Factor Equations for Trace Elements from Coal Combustion0 (Emission Factor Equation Rating: A)b

Pollutant Emission Equation



0.92 [(C/A)PM]06


3.1 [(C/A)PM]a85


1.2 [(c/a)pm]l1


3.3 [(c/a)pm]°.5


3.7 [(C/A)PM]0.58


1.7 [(C/A)PM]a69


3.4 [(C/A)PM]a80


3.8 [(C/A)PM]0.60


4.4 [(C/A)PM]a48

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. The equations were developed from emissions data from bituminous coal combustion, subbituminous coal combustion, and lignite combustion. The equations may be used to generate factors for both controlled and uncontrolled boilers. The emission factor equations are applicable to all typical firing configurations for electric generation (utility), industrial, and commercial/industrial boilers for bituminous coal, subbituminous coal, and lignite. bAP-42 criteria for rating emission factors were used to rate the equations.

cThe factors produced by the equations should be applied to heat input. To convert from lb/1012 Btu to kg/J, multiply by 4.31 x 10-16. C = concentration of metal in the coal (parts per million by weight [ppmwt]). A = weight fraction of ash in the coal; for example, 10% ash is 0.1 ash fraction. PM = site-specific emission factor for total particulate matter (lb/106 Btu).

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