24.

DIRECTIVE 2008/50/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 21 May 2008 on ambient air quality and cleaner air for Europe · European Union

‘oxides of nitrogen’ shall mean the sum of the volume mixing ratio (ppbv) of nitrogen monoxide (nitric oxide) and nitrogen dioxide expressed in units of mass concentration of nitrogen dioxide (μg/m3);

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Source: EUR-Lex CELLAR · retrieved 2026-08-09 · Text as consolidated on 2015-09-18; changes after this date are not shown.