The purpose of this paper it’s a brief description of the abatement strategies, aftertreatment systems and technologies which reduce the harmful emission gases fllowing from cars pipes. With emission norms becoming more and more stringent, industries are using technologies to reduce NOx emissions, Hydrocarbons (HCs) , Carbon Monoxide (CO) and particulates matters (PM) and so on. Nitrous Oxides (NOx for short) are one of the most harmful pollutants produced by automobiles, damaging the ozone layer and the environment. Hence, countries like U.S, Japan and those in the European Union have come up with more stringent emission norms to reduce the impact on the environment. Serious efforts are being made to reduce the amount of these harmful gases emitted by automobiles, especially those using Diesel Engines.

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