Which of the following forms of pollution is the least harzardous to man ??

Which of the following forms of pollution is the least harzardous to man ??
  • A.
    Toxic waste disposed in rivers
  • B.
    The use of chemicals for fishing
  • C.
    Flaring of gas from refineries
  • D.
    A sound of 50 decibles in the air
Correct Answer: Option D
Explanation
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