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Directive (EU) 2024/2881 of the European Parliament and of the Council of 23 October 2024 on ambient air quality and cleaner air for Europe (recast) · European Union
The ‘Accumulated Ozone exposure over a Threshold of 40 parts per billion’ (AOT40), expressed in ‘(μg/m3) × hours’, means the sum of the difference between hourly concentrations greater than 80 μg/m3 (= 40 parts per billion) and 80 μg/m3 over a given period using only the 1-hour values measured between 8:00 and 20:00 Central European Time (CET) each day.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-16 · Text as adopted (Official Journal); later amendments are not incorporated in this text.