پزشکی بالینی ابن سینا (Mar 2003)
A Comparison of Major Pollutants Emission from Petrol and Diesel Car Exhaust
Abstract
Motor vehicle emissions are a major anthropogenic source of air pollution. In this study, a comparison of amounts of major emission pollutants that they regulated in UK was done for three types of automobile includes standard petrol, petrol with TWC and diesel. Also a comparison of amount of carbon dioxide emission that it is important in green house effect was shown in those three types of automobile. For this purpose 300 automobiles were chosen after primary investigation and pollutants emissions were tested in different condition of engine and environmental temperature. The result of this study showed pollutant emission includes THC, NOx and CO from petrol car was higher than that from diesel engine when engine was hot (P<0.001 , P< 0.0228 and p<0.0336 respectively) but amount of those emission pollutant in car with TWC was close to amounts from diesel engine . The amount of particles from diesel engine was attentionable in comparison with one’s from petrol and petrol with TWC car. Also the results showed that CO and THC emission from two types of TWC petrol and diesel car were higher when environmental temperature was low. Although amount of CO2 in middle speed was lower from diesel engine. In many cases most light hydrocarbons from petrol vehicles with TWC were higher than diesel engine that a clear difference was noticeable for amount of toluene emission (P<0.004). It is not possible to make a direct comparison of environmental friendlines of TWC petrol and diesel vehicle. From the present study’s results, it is recommendable that petrol car manufactures have to install TWC system on all petrol vehicle and government should provide new standard and strong legislations for all new and old petrol and diesel vehicles.
