Aerosol composition refers to the chemical and physical components found in atmospheric aerosols, which are tiny particles suspended in the air. These particles can be made up of a variety of substances, including organic compounds, inorganic salts, metals, and microorganisms. Aerosol composition plays a crucial role in determining the properties and behavior of aerosols, such as their ability to scatter or absorb sunlight, their impact on climate and air quality, and their potential to act as cloud condensation nuclei. Researchers study aerosol composition to better understand the sources, transformations, and impacts of atmospheric aerosols on the environment and human health.