Particulates, alternatively referred to as particulate matter (PM) or fine particles, are tiny particles of solid or liquid suspended in a gas or liquid. In contrast, aerosol refers to particles and the gas together. Sources of particulate matter can be man made or natural. Particulate Matter—(Water quality) In water pollution, particulates can either be in a solid or dissolved state. Solid particulates can be removed by filters or settle from the water, and's referred to as insoluble part… (More on Particulate)