4- NOX is chemically known as 4-Nitro-o-xylene which is a yellow to brown colored compound available in liquid as well as semi-solid forms. This industrial chemical is commonly used as an intermediate during the formulation of agrochemicals. It has a chemical formula of C8H9NO2 with a molar mass nearly equal to 151.16 grams per mol. 4- NOX is slightly soluble in water and is highly incompatible with strong oxidizers and strong bases.