Which one of the following is NOT an air pollutant ?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Sirens and loudspeaker
Option (1) Solid waste disposal — Linked with air pollution. It is a source of air pollution, along with the burning of coal, petrol and diesel and industrial processes.
Option (2) Carbon monoxide — An air pollutant. It is a gas that pollutes the air.
Option (3) Lead and asbestos — An air pollutant. Both are air pollutants.
Option (4) Sirens and loudspeaker — Not an air pollutant. They cause noise pollution, not air pollution.
NCERT (2026-27):
Table 9.1 : Types and Sources of Pollution “Noise Pollution … The main sources of noise pollution are various factories, mechanised construction and demolition works, automobiles and aircraft, etc. There may be added periodical but polluting noise from sirens, loudspeakers used in various festivals, programmes associated with community activities.” |
