Editing Combustion (section)

=====Environmental problems=====
These oxides combine with [[water]] and [[oxygen]] in the atmosphere, creating [[nitric acid]] and [[sulfuric acids]], which return to Earth's surface as acid deposition, or "acid rain." Acid deposition harms aquatic organisms and kills trees. Due to its formation of certain nutrients that are less available to plants such as calcium and phosphorus, it reduces the productivity of the ecosystem and farms. An additional problem associated with [[nitrogen oxides]] is that they, along with [[hydrocarbon]] pollutants, contribute to the formation of [[ground level ozone]], a major component of smog.<ref name="education.seattlepi.com">{{cite web|title=Environmental Problems associated with incomplete combustion |work= Seattle PI - Education|date= 25 February 2014|url= http://education.seattlepi.com/environmental-problems-associated-combustion-hydrocarbons-5621.html|last1= Reeder|first1= Elizabeth}}</ref>