Q1. The most common substance responsible for pollution is
(a) Smoke
(b) Carbon dioxide
(c) Sulphur dioxide
(d) Carbon monoxide
(UPSC Prelims, 1979)
Answer: (a) Smoke
Explanation:
Smoke, which contains a mixture of particulate matter and harmful gases, is a major contributor to air pollution. It originates from industrial emissions, vehicle exhausts, and burning of biomass, affecting air quality and human health.
