Benzene is a highly volatile aromatic hydrocarbon solvent which is present in most petroleum distillates such as Stoddard solvent and mineral spirits. Recent advances in the purification process for these solvents has reduced the benzene content significantly, but it is still present in products such as WD-40 and Liquid Wrench as well as many solvents used in the printing industry and elsewhere.
Lead is ubiquitous in our environment. It used to be contained in gasoline but has now been replaced. It has been used in pipes, ceramic glazes, paints, and solder, among other sources. Exposure can be oral through ingestion of food or water or by inhalation from lead-containing dust or dirt.
Most creosote mixtures that are used today are byproducts of the petroleum industry or coal gasification processes. They are mixtures of several hundreds of chemicals mostly polynuclear aromatic hydrocarbons (PAHs) but contain a host of other chemicals including complex heterocyclic compounds