<prompt> Translate the following text to EnglishSheria ya anga safi inabadilisha baadhi ya vifungu vya Kichwa I cha Sheria ya Hewa safi ambayo kwa sasa inatumika kwa vitengo vya kuchoma vinavyofunikwa na mipaka mpya ya uzalishaji wa Kichwa IV.  <response>: Further, the Clear Skies Act amends certain provisions of Title I of the Clean Air Act that currently apply to the combustion units covered by the new Title IV emission caps. 