ABSTRACT

Limiting gaseous emissions into the air is technically difficult as well as expensive. Although it is true that rain is “Nature’s vacuum cleaner”—the only natural air-cleansing mechanism available-it is not very efficient. Good air quality depends on pollution prevention (limiting what is emitted) and sound engineering policies, procedures, and practices. The control of gaseous air emissions may be realized in a number of ways. In this chapter, we discuss many of these technologies, as well as the sources of gaseous pollutants emitted from various sources and their control points (see Figure 8.1).