In the environment by various processes such as incomplete combustion of recent and fossil organic matter at higher temperatures, slow maturation of organic matter under geochemical gradient conditions. Most PNH inputs in the environment are linked to the anthropogenic activity that is generally considered to be the major source of these compounds. PNHs have different distribution patterns according to their production sources. In addition, physical–chemical properties of some PNHs, like chemical reactivity, can contribute to modify the original distribution pattern of the emission sources. PNHs in general are toxic, carcinogenic in many animals, act as anti-estrogens in mammals, and induce reproductive toxicity in women. Degradation is the most common way to remove PNHs in the environment. PNHs partially dissolved in water tend to be adsorbed in suspended solids PNHs in water bodies can accumulate in fatty tissues of organisms through the food chain. Thus, it is imperative to understand the relative importance of pollutant emission sources for coastal air and watersheds.

Keywords: PNHS; Taps; Cops; Toxic; Carcinogenic.