Emission Factor Documentation for AP42 Portland Cement ...
cement plants with wet process kilns is 305006, and the sixdigit SCC for plants with dry process kilns is 305007. CHARACTERIZATION OF THE INDUSTRY14 As of December 1990, there were 112 operating portland cement plants in the United States, with 109 of these plants producing gray cement and the other 3 producing white cement. These 112 ...