Volume No. 2 Issue No.: 4B Page No.: 808-816 April-June 2008




Rajesh Kumar Pandey*, A. Rehman and R.M. Sarviya

Department of Mechanical Engineering, M. A. N. I. T., Bhopal (India)


Received on : October 12, 2007




If you want to live comfortably you need to have good surroundings. At least all the basic needs like air, water, food, etc. are the essential elements. We are always selective when it comes to food. We certainly think of hygiene and end up eating as well as preparing good food in clean places. Similarly one should have the same attitude towards the environment. We breathe air, true, but what kind of air? We are not very bothered about its composition; the only thing we do is go for a weekend outside the city and say we are in search of fresh air. We then come back and survive for another week. Have we ever thought of this? We all know that in cities like Mumbai. Delhi, Kolkatta etc. two-third of the air we breathe is polluted. The cause of this is unwanted effluents emitted by auto vehicles plying on the roads and the industries. These emissions are very harmful to human beings.
This paper explores the undesirable emissions generated in the combustion process of C.I.Engine and other auto vehicles. These emissions pollute the environment and contribute to global warming, acid rain, smog, odors, and respiratory and other health problems. The major causes of these emissions are non-stoichiometric combustion, dissociation of nitrogen and impurities in the fuel and air. The emissions of concern are hydrocarbons (HC), carbon mono-oxide (CO), oxides of nitrogen (NOX), sulphur, and solid carbon particulates. Ideally, engines and fuels could be developed such that very few harmful emissions are generated and these could be exhausted to the surroundings without a major impact on the environment. With present technology this is not possible and after treatment of the exhaust gases to reduce emissions is very important. This consists mainly of the use of the thermal or catalytic converters and particulate traps.


Keywords : Diesel exhaust, Air pollution, Clean fuel, Emission