Just a couple decades ago, nitrogen oxide emissions routinely plagued cities’ skies and their residents’ lungs. These polluting reactive nitrogen oxide gases from the tailpipes of combustion-engine ...

NOx pollution occurs when nitrogen oxides are released as a gas into the atmosphere during the high-temperature combustion of fossil fuels. These nitrogen oxides consist mainly of two molecules, ...

HOUSTON, Mar. 8 An experimental nitrogen oxide emission control system will undergo its first commercial scale demonstration beginning this summer at an American Electric Power Co. Inc. (AEP) ...

WASHINGTON — The Environmental Protection Agency on Dec. 20 announced more stringent clear-air standards for heavy trucks that the agency said are 80% stronger than current limits. Starting with model ...

WASHINGTON — U.S. Environmental Protection Agency officials announced Nov. 13 they have begun an environmental review to reduce nitrogen oxide emissions from heavy-duty truck engines. Top agency ...

A southern Indiana chemical plant released an orangish cloud of nitrogen oxide Tuesday, prompting officials to close nearby roads and issue shelter-in-place orders until the cloud dissipated.

A new study from an international group of scientists finds we are releasing more of the greenhouse gas nitrous oxide into the atmosphere than previously thought. Most of us know nitrous oxide as ...

DETROIT (AP) — In a little over four years, new heavy truck makers will have to cut harmful nitrogen oxide pollution more than 80% under new standards released Tuesday by the U.S. Environmental ...