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    Author(s):  P. H. KULKARNI, H. R. KULKARNI  

Diesel is widely used by society. It is generally used for heavy duty vehicles. Unfortunately, the exhaust from these engines contains substances affects seriously on human health.The global burden of disease study estimated eight lakh premature deaths in 2015 due to continued exposure to outdoor particulate matter. Air quality is a cause for concern in India, particularly in major cities and air pollutants including particulate matter (PM), sulfur dioxide (SO2), nitrogen oxides (NOx), carbon monoxide (CO), and ozone (O3) often exceed the National Ambient Air Quality Standards (NAAQS). Over automotive exhaust emission worldwide, several exhaust pre-treatment and post treatment techniques have been employed in modern engines. Exhaust Gas Recirculation (EGR) is being used widely to reduce and control the oxides of nitrogen (NOx) emission from diesel engines. These EGR controls the NOx because it lowers oxygen concentration and flame temperature of the working fluid in the combustion chamber. The attempt is made to study the effects of exhaust gases on human health, its atmospheric level in major cities of India and the need of EGR is done.

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