In today’s world, facilities face the daunting challenge of minimizing the environmental impact of industrial processes. A primary motivation for industrial plants to control their environmental impact is government regulation. In the US, these regulations are issued at the national level by the Environmental Protection Agency (EPA) and similar agencies at the state and local levels.
Before the US government passed the first Clean Air Act in 1963, no federal regulations on gaseous emissions existed. The Clean Air Act initiated research to investigate techniques to monitor and control air pollution. During the 1970s and 1980s, the government passed legislation that established a limit on emission of 10,000 parts per million (ppm) for gases defined as volatile hazardous air pollutants (VHAPs).
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