<prompt> Translate the following text to EnglishAmonia na urea pia zinapatikana kwa wingi, ingawa inatarajiwa kwamba kupunguza NOx itasababisha ongezeko la wastani la mahitaji ya Marekani.  <response>: Ammonia and urea supply is also plentiful, although it is expected that NOX reduction will cause a moderate increase in U.S. demand. 