railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Air and Noise Pollution

 According to the Air (Prevention and Control of Pollution) Act, 1981, how is the term ‘Emission’ defined?

1
Only the solid particles coming out of an outlet
2
Only the liquid substance coming out of an outlet
3
Only the gaseous substance coming out of an outlet
4
Any solid or liquid or gaseous substance coming out of any chimney, duct or flue or any other outlet
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