short answer questions

1.  Discuss the reasons for air pollution regulations. Also, explain the concept of averaging time in the U.S. National Ambient Air Quality Standards (NAAQS). Finally, explain emission offsets. (200 words)

2.  Describe the purpose and operation of flue gas desulfurization. (200 words)
 

3.  Differentiate frequency, wavelength, loudness, and pitch. (300 words)
 

4.  Describe three methods to reduce indoor sources of noise pollution. (300 words)