ABSTRACT
This chapter describes the technologies in use to reduce emission of noxious gases into the atmosphere. Stationary sources and mobile sources are described as well as various integrated emission control technologies and add-on emission control technologies. Emission control, in the simplest sense, is a means to protect the atmosphere. It is also the relationship of air quality to emission levels and the development of control standards. The general approach to emission control is directed toward managing the emission source. Strategies for reducing emissions have often concentrated on removing chemical pollutants from a stream of air after the pollutants are formed. Such control methods are referred to as add-on control methods, or flue gas control methods, or end-of-pipe control methods. Most human activities produce airborne emissions of gases or particulate matter. Therefore, the technologies to control the emissions are essential to any industrial operation. Add-on technologies are, as the name implies, a technological method for controlling emissions from an emission-producing process.
