Whether in mouse pads, toys, or bathing shoes – polycyclic aromatic hydrocarbons (PAHs) are ubiquitous. We encounter PAHs as atmospheric pollutants produced by small combustion units (such as fireplaces and stoves in homes), traffic, industrial processes, and tobacco smoke. They can also be detected in foodstuffs, especially at summertime BBQ events or in smoked products. What are polycyclic aromatic hydrocarbons and what risk do they represent? Why do we find PAHs time and again in objects of everyday use, and why do we encounter them on a daily basis? What is done to address the problem, and what can each individual do? The German Environment Agency (UBA) would like to answer these and other questions in this publication.