Which of the following is the most important problem related to air pollution?
A.	ozone depletion.
B.	the manner in which nuclear wastes are being disposed of.
C.	poor quality of air in non-urban areas.
D.	non-hazardous air pollutants.
Answer:A
Which of the following is the most important problem related to air pollution?
A.	ozone depletion. B.	the manner in which nuclear wastes are being disposed of. C.	poor quality of air in non-urban areas. D.	non-hazardous air pollutants.