90In the light of the foregoing considerations, the answer to the second question is that Article 3(10) of Regulation No 715/2007 must be interpreted as meaning that the concept of an ‘emission control system’, within the meaning of that provision, covers both ‘exhaust gas after-treatment’ technologies and strategies that reduce emissions downstream, that is to say after their formation, and those which, like the EGR system, reduce emissions upstream, that is to say during their formation.
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