noun
Broad term covering several nitrogen-oxygen compounds; often refers to nitric oxide (NO) but can include nitrous oxide (N₂O), nitrogen dioxide (NO₂), dinitrogen pentoxide (N₂O₅), etc. Context usually specifies the exact compound.
自動車の排気ガスには酸化窒素が含まれている。
Automobile exhaust contains nitrogen oxides.
Nitrogen oxides are one of the causative agents of air pollution.