Nitrogen is a chemical element that is found in the air we breathe. It does not have any color or smell. Plants and animals need nitrogen to survive. It is also used in making fertilizers. Full definition
The defeat devices cause the vehicles to emit «much higher» than allowable levels of nitrogen oxide pollution, according to the suit. (automobilemag.com)
Large amounts of nitrogen oxide compounds are produced in particular by intensive lightning over land. (sciencedaily.com)
However, it is considered responsible for more than a 200 % increase of nitrogen in wastewater, resulting in higher treatment costs. (constantinealexander.net)