Which amongst the given is not a natural source of air pollution?

Exhaust gases and fumes from power plants.

Explanation:

Air pollution arises from both natural and man-made sources. Understanding these sources is crucial in identifying which is not a natural source of pollution.

Natural Sources of Air Pollution:

• Forest Fires: Emit smoke and ash into the atmosphere.
• Volcanic Eruptions: Release dust, smoke, and gases such as sulfur and chlorine.
• Decomposition of Organic Matter: Produces methane gas from decaying plant and animal material.

Man-Made Sources of Air Pollution:

• Power Plants: Emit exhaust gases and fumes, including sulfur dioxide and nitrogen oxides, primarily from burning fossil fuels.

Given the options, exhaust gases and fumes from power plants are not a natural source of pollution; they result from human industrial activities.