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Objective | Averaging period | Target value | Date by which target value should be met (1) Protection of human health | Maximum daily eight-hour mean (2) | 120 μg/m3 not to be exceeded on more than 25 days per calendar year averaged over three years (3) | 1.1.2010 Protection of vegetation | May to July | AOT40 (calculated from 1 h values) 18 000 μg/m3 · h averaged over five years (3) | 1.1.2010 (1) Compliance with target values will be assessed as of this date. That is, 2010 will be the first year the data for which is used in calculating compliance over the following three or five years, as appropriate. (2) The maximum daily eight-hour mean concentration shall be selected by examining eight-hour running averages, calculated from hourly data and updated each hour. Each eight -hour average so calculated shall be assigned to the day on which it ends. i.e. the first calculation period for any one day will be the period from 17:00 on the previous day to 01:00 on that day; the last calculation period for any one day will be the period from 16:00 to 24:00 on the day. (3) If the three or five year averages cannot be determined on the basis of a full and consecutive set of annual data, the minimum annual data required for checking compliance with the target values will be as follows: — for the target value for the protection of human health: valid data for one year, — for the target value for the protection of vegetation: valid data for three years.

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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.