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The Air (Prevention and Control of Pollution) Act was amended in 1987 to include:

ASmoke
BDust
COzone
DNoise
Answer & Solution
Correct answer: D. Noise
1. The Act came into force in 1981. 2. Noise was added as an air pollutant in 1987. 3. Noise is undesired high level of sound. _Source: syllabus Biology, Chapter 16, Environmental Issues._
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