4.
Council Directive 96/62/EC of 27 September 1996 on ambient air quality assessment and management · European Union
To take into account the actual levels of a given pollutant when setting limit values and the time needed to implement measures for improving the ambient air quality, the Council may also set a temporary margin of tolerance for the limit value. This margin shall be reduced according to procedures to be defined for each pollutant in order to attain the level of the limit value at the latest at the end of a period to be determined for each pollutant when that value is set.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.