Which of the following is not a source of air pollution?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Use of bio-energy
Air pollution is the addition of contaminants such as dust, fumes, gas, smoke or vapour to the air. Combustion of fossil fuels, mining and industries are its main sources.
Option (1) Industrial processes — A source of air pollution. Industrial processes are a main source of air pollution.
Option (2) Use of bio-energy — Not a source of air pollution. Bio-energy is energy made from biological products such as agricultural residues and municipal and industrial wastes. It is a non-conventional source of energy, and its use helps to reduce environmental pollution.
Option (3) Combustion of coal — A source of air pollution. Burning coal, petrol and diesel pollutes the air.
Option (4) Solid waste disposal — A source of air pollution. Disposal of solid waste also adds pollutants to the air.
NCERT (2026-27):
Table 9.1 : Types and Sources of Pollution (part) “Bio-energy Bio-energy refers to energy derived from biological products which includes agricultural residues, municipal, industrial and other wastes. … This will improve economic life of rural areas in developing countries, reduce environmental pollution, enhance self-reliance and reduce pressure on fuel wood.” |
