A. Upper and lower assessment thresholds

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

The following upper and lower assessment thresholds will apply: Health protection Vegetation protection Upper assessment threshold 60 % of 24-hour limit value (75 μg/m^(3), not to be exceeded more than 3 times in any calendar year) 60 % of winter critical level (12 μg/m^(3)) Lower assessment threshold 40 % of 24-hour limit value (50 μg/m^(3), not to be exceeded more than three times in any calendar year) 40 % of winter critical level (8 μg/m^(3)) Hourly limit value for the protection of human health (NO_(2)) Annual limit value for the protection of human health (NO_(2)) Annual critical level for the protection of vegetation and natural ecosystems (NO_(x)) Upper assessment threshold 70 % of limit value (140 μg/m^(3), not to be exceeded more than 18 times in any calendar year) 80 % of limit value (32 μg/m^(3)) 80 % of critical level (24 μg/m^(3)) Lower assessment threshold 50 % of limit value (100 μg/m^(3), not to be exceeded more than 18 times in any calendar year) 65 % of limit value (26 μg/m^(3)) 65 % of critical level (19,5 μg/m^(3)) The upper assessment threshold and the lower assessment threshold for PM_(2,5) do not apply to the measurements to assess compliance with the PM_(2,5) exposure reduction target for the protection of human health. 24-hour average PM_(10) Annual average PM_(10) Annual average PM_(2,5) Upper assessment threshold 70 % of limit value (35 μg/m^(3), not to be exceeded more than 35 times in any calendar year) 70 % of limit value (28 μg/m^(3)) 70 % of limit value (17 μg/m^(3)) Lower assessment threshold 50 % of limit value (25 μg/m^(3), not to be exceeded more than 35 times in any calendar year) 50 % of limit value (20 μg/m^(3)) 50 % of limit value (12 μg/m^(3)) Annual average Upper assessment threshold 70 % of limit value (0,35 μg/m^(3)) Lower assessment threshold 50 % of limit value (0,25 μg/m^(3)) Annual average Upper assessment threshold 70 % of limit value (3,5 μg/m^(3)) Lower assessment threshold 40 % of limit value (2 μg/m^(3)) Eight-hour average Upper assessment threshold 70 % of limit value (7 mg/m^(3)) Lower assessment threshold 50 % of limit value (5 mg/m^(3))

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Source: EUR-Lex (Cellar) · retrieved 2026-09-25 · Text as consolidated on 2015-09-18; changes after this date are not shown.