The Integrated Air Pollution Control System (IAPCS) Cost Model was developed to estimate costs and performance for emission control systems applied to coal-fired utility boilers. The model can project a material balance, an equipment list, and capital investment and revenue requirements based on user-specified input data. The model includes conventional and emerging technologies for controlling nitrogen oxides (NOX), sulfur dioxide, and particulate matter emissions. A variety of technology modules built into the model can be incorporated and combined. Cost and performance estimates can be analyzed in terms of integrated technologies. Conventional and emerging technologies included are low NOX combustion (overfire air/low NOX burners), natural gas reburning, advanced gas reburning, selective catalytic reduction, selective noncatalytic reduction, limestone injection multistage burners, the advanced silicate process, wet limestone flue gas desulfurization, dry sorbent injection, physical coal cleaning, coal switching, lime spray drying, spray humidification, electrostatic precipitators, fabric filters, atmospheric fluidized bed combustion, pressurized fluidized bed combustion, the integrated gasification combined cycle process, and pulverized coal burning boilers.