another place where nitrogen oxide is found
A natural source of nitrogen oxides occurs from a lightning stroke. The very high temperature in the vicinity of a lightning bolt causes the gases oxygen and nitrogen in the air to react to form nitric oxide. N2 + O2 --> NO. The nitric oxide very quickly reacts with more oxygen to form nitrogen dioxide. NO + O2 --> NO2. Both of the nitrogen compounds are known collectively as nitrogen oxides or NOx.