This is considered a bubble policy to protect the environment, which allows pollution will be on plantwide basis, not stack, stack. Pollution constraint is added to the linear programming model that can be used for production planning and control of environmental pollution.
This Darden study. "Hide
by Samuel E injuries, Sherwood C. Frey, H Landis Gabel, VK Sessoms Source: University of Virginia Darden School Foundation 13 pages. Publication Date: April 1, 1989. Prod. #: UV0562-PDF-ENG