The Integrated Air Pollution Control System (IAPCS) is a computerized simulation model developed for EPA's Air and Energy Engineering Research Laboratory (AEERL) to estimate the costs and predict the performance of sulfur dioxide (SO2), nitrogen oxides (NOx), and particulate matter (PM) emission control systems for coal-fired utility boilers. The model includes conventional and emerging technologies that effect pre-, in situ, and post-combustion emission control. The model can accept any combination of the technology modules built into the system. Alterations in the material balance are used to account for integrated performance and cost effects. The emission control technologies contained in IAPCS can be selected in either isolated or integrated configurations. The power of IAPCS lies in its ability to reflect integrated effects of various control configurations. This allows the analyst to identify synergistic interactions and thus optimize performance and cost in terms of integrated cost effectiveness. Software Description: The program is written in the Fortran programming language for implementation on an IBM-PC AT or compatible microcomputer using the PC-DOS operating system. 512K bytes of core storage required. 1.5 Mbytes hard disk space; 80287 recommended.