Question

Read the given text and answer the questions that follow:

The combustion of fossil fuels increases the number of suspended particles in the air. The suspended particles could be unburned carbon particles or substances called hydrocarbons. The presence of high levels of these pollutants causes visibility to be lowered, especially in cold weather, when water also condenses in the air to form smog.

1. Mention the solid particles in the air, other than the unburned carbon particles and hydrocarbons.
2. What is the role of solid particles in the air?

Answer 1

1. Solid particles in the air, other than unburned carbon particles and hydrocarbons, include dust, smoke particles, metal particles, oxides of silicon, aluminium, calcium, and mercury released from industrial processes, as well as various particulate matter, like soot and other suspended solids.
2. The role of solid particles in the air includes acting as nuclei for the condensation of water vapour, which helps in the formation of clouds and fog. They also contribute to the lowering of visibility, especially when combined with water droplets to form smog, which is harmful to health. Additionally, these particles can carry pollutants and toxins, causing respiratory and other health problems.