Question

Human activities are not the only cause of air pollution. There are a number of natural pollutants present in the atmosphere. Tick the natural pollutant from the options given below.

Options

• Brick kilns

• Forest fires

• Burning of farm waste

• Salt

Answer 1

Forest fires

Explanation:

Forest fires are a natural source of air pollutants (the files list volcanic eruptions, forest fires, and dust storms as natural sources), whereas brick kilns and burning farm waste are human-made sources.