Noise was added as an air pollutant when the Air Act of 1981 was amended in:
A2002
B1987
C1974
D1986
Answer & Solution
Correct answer: B. 1987
1. The Air Act came into force in 1981.
2. A later amendment brought noise under it.
3. That amendment was in 1987.
_Source: NCERT Class 12 Biology, Chapter 16, Environmental Issues._
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