(a)

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

"AOT 40" means the sum of the difference between hourly concentrations of ground-level ozone greater than 80 μg/m3 (= 40 ppb) and 80 μg/m3 during daylight hours accumulated from May to July each year;

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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.