Pyrene

Pyrene is a polycyclic aromatic hydrocarbon, which is a type of organic molecule made up of multiple fused rings of carbon and hydrogen atoms. You'll find pyrene in coal tar, cigarette smoke, and vehicle exhaust, making it a common environmental pollutant that scientists are concerned about because of its potential health effects. Researchers often use pyrene as a model compound to study how these persistent pollutants behave in the environment and how living organisms respond to exposure.