<prompt> Translate the following text to SwahiliEPAs requirement, adopted in response to section 126 petitions, that sources in a number of eastern states reduce NOx emissions was recently upheld by the Court of Appeals for the District of Columbia Circuit.  <response>: Mahakama ya Rufaa ya Wilaya ya Columbia ilithibitisha mahitaji ya EPA, yaliyopitishwa katika majibu ya maombi ya sehemu ya 126, kwamba vyanzo katika majimbo kadhaa ya mashariki hupunguza uzalishaji wa NOx. 