(i)
Directive 2001/81/EC of the European Parliament and of the Council of 23 October 2001 on national emission ceilings for certain atmospheric pollutants · European Union
"nitrogen oxides" and "NOx" mean nitric oxide and nitrogen dioxide, expressed as nitrogen dioxide;
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Source: EUR-Lex (Cellar) · retrieved 2026-10-29 · Text as adopted (Official Journal); later amendments are not incorporated in this text.