Quinoline is an organic compound found in coal tar and oil shale. It enters water from industrial pollution and manufacturing processes. Quinoline is a potential carcinogen.

Quinoline is a colorless, oily liquid with a strong odor. It's primarily used in the production of other chemicals and pharmaceuticals. This compound can persist in the environment, particularly in water and soil. Industrial wastewater and runoff are common sources of water contamination. Quinoline is typically detected using gas chromatography or high-performance liquid chromatography. While regulated in some countries, its status varies globally. Research suggests potential health risks, prompting ongoing studies and monitoring efforts.