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The EGR system routes many of the exhaust gases (6 ? 10%) through the EGR valve, last on the Intake System, and in the end in the combustion chamber. The exhaust gases are inert i.e. they don't burn within the combustion chamber; also, the exhaust gases use up a number of the space which could preferably be taken with the intake air. This decreases the volume of intake air available for the combustion process during each Power Stroke; which experts claim decreases the peak combustion temperatures. This leads to lower NOx emissions. 2. How aggressive they may be When HTML 4 was introduced, it brought different form of great changes in terms of design and development as many of developers were allowed to use different fonts while designing and creating text. HTML 5 brings the promise of an excellent tomorrow with advanced features like mobile based design, audio and video tagging along with drag and Drop functions. In fact, a newly released IT expert has proved that approximate 50% of internet users has using HTML 5 compatible browsers.