Volume 2 - Issue 2, March - April 2026

Public transportation systems are essential for supporting large-scale mobility, yet they remain a consistent source of atmospheric emissions if not maintained properly, due to their reliance on internal combustion engine technologies. This literature review examines the composition and behavior of pollutants emitted from public vehicles, with a primary focus on unburnt hydrocarbons (UHCs) on poorly maintained transport. These compounds are generated through incomplete combustion processes and represent a chemically diverse group of pollutants with significant roles in atmospheric reactions. In this article, I will focus solely on pollution levels that exceed the prescribed limits. The review synthesizes current knowledge on the mechanisms of UHC formation, their chemical characteristics, influencing factors, and their interactions within atmospheric systems. The findings emphasize the importance of understanding hydrocarbon emissions in evaluating transport-related pollution and their broader environmental implications on poorly maintained vehicles.

Prahan Prabhu,"Characterization and Atmospheric Behavior of Unburnt Hydrocarbons and Pollutants in the Exhaust of Poorly Maintained Vehicles" International Journal of Advanced Multidisciplinary Research and Educational Development, V2(2): Page(861-863) Mar-Apr 2026. ISSN: 3107-6513. www.ijamred.com. Published by Scientific and Academic Research Publishing.