Which of the following statements best describes what has happened to

Which of the following statements best describes what has happened to air quality since the United States outlawed the use of chlorofluorocarbons, halons, and carbon tetrachloride?

a. Air quality immediately improved.
b. Air quality is slowly improving.
c. Little change occurred because these chemicals remain in the atmosphere.
d. Nothing has happened because other countries worldwide continue to extensively use these products.

ESSAYBID ANSWER

ANS: C
These chemicals, which were in widespread use, remain in the atmosphere. Thus, air quality has not improved. This is a global concern and is being addressed worldwide by the World Health Organization.