As the name implies, indoor air pollution deals with air contamination in enclosed spaced such as homes, offices, and work areas. Suppose that you are studying the ventilation system for Donny's secret, a truck$-$stop restaurant located adjacent to an eight$-$lane freeway. As depicted in Figure $2($source: S$.$C$.$ Chapra $2010),$ the restaurant serving area consist two rooms for smokers and kids and one elongated room. Room $1$ and section $3$ have sources of carbon monoxide from smokers and a faulty grill, respectively. In addition, rooms $1$ and $2$ gain carbon monoxide from air intakes that unfortunately are positioned alongside the freeway.