Which of the following is the main source of particulates in the atmosphere?

The main source of particulates in the atmosphere is primarily due to the incomplete combustion of fuels. When fuels, such as coal, oil, or gasoline, are burned without enough oxygen, they do not combust fully, leading to the formation of solid particles and liquid droplets. These particulates, which include soot, unburned hydrocarbons, and other complex organic and inorganic materials, can contribute to air pollution and have various health effects.

In contrast, complete combustion produces carbon dioxide and water vapor, minimizing particulate matter release. Although natural dust storms and volcanic eruptions can contribute to atmospheric particulates, the scale and regularity of particulates generated from the incomplete combustion of fuels, particularly in urban and industrial settings, make it the primary source.