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nitrogen oxide
This term serves as a collective designation for a family of gases, most notably nitric oxide (NO) and nitrogen dioxide (NO2). In environmental and chemical contexts, it is frequently used to describe pollutants resulting from high-temperature combustion in engines and industrial plants.
Because it refers to a chemical species or a class of compounds, it is treated as an uncountable noun. It does not take a plural form in standard scientific usage; instead, quantities are specified using mass units or concentrations (e.g., "levels of nitrogen oxide").