Comparative exhaust emission study of diesel and CNG fuel buses of Karnataka State Road Transport Corporation

This paper deals with the exhaust emissions emitted by the Diesel buses of Karnataka State Road Transport Corporation and suggestions to reduce the emission levels by the use of an alternative clean fuel CNG. The pollution loads have been calculated and compared by considering usage of the Compressed Natural Gas (CNG) in place of conventional diesel buses. In this study, the Karnataka State Road Transport Corporation was considered and collected the required information such as the total number of buses, daily kilometres operated by the KSRTC buses. These buses run on diesel fuel and are responsible for largest amount of lead emissions and various other pollutants. The pollution loads calculated on the basis of information collected from the Central Pollution Control Board (CPCB), Environment Protection Agency and previous studies carried out in this regard by various important agencies. The use of CNG shows tremendous reduction in various pollutants in gm/km. By the use of CNG we can find 84% reduction in CO, 58% reduction in NOx and 97% reduction in PM.