This document discusses the effect of hydro emulsification in diesel engines. It describes how water/diesel emulsified formulations can reduce emissions of nitrogen dioxide, carbon monoxide, carbon dioxide, and particulate matter without compromising engine performance or increasing specific fuel consumption. The emulsification process involves mixing diesel, water, and a surfactant to properly bind the molecules and form an emulsion. Surfactants are compounds that lower surface tension and decrease interfacial tension between liquids or between a liquid and solid, allowing them to act as emulsifiers.