<prompt> Translate the following text to EnglishWatengenezaji wa mifano ya ubora wa hewa wanakabiliwa na changamoto mbili kuu katika kujaribu kutafsiri hesabu za uzalishaji katika viwango vya uchafuzi.  <response>: Air quality modelers face two key challenges in attempting to translate emission inventories into pollutant concentrations. 