The present project proposed to assess the extent of atmospheric pollution caused by the exhaust system of mobile internal combustion (IC) engines. The appropriate experimental and analytical investigations were undertaken. A smoke meter was used for assessing pollution from diesel vehicles while for petrol-driven vehicles, use was made of an engine gas analyser. The relevant parameters monitored were identified as follows:
⢠for diesel vehicles : Smoke opacity level
⢠for petrol vehicles : HC and CO emissions.
On-road tests were carried out on samples of the diesel- and petrol-driven vehicle populations, which were worked out using the Stratified Random Sampling Method. In parallel with the project, a survey was carried out to assess the perception of the general public, drivers and enforcement officers vis-Ã -vis vehicle pollution.