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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

| Hourly limit value for the protection of human health (NO2) | Annual limit value for the protection of human health (NO2) | Annual critical level for the protection of vegetation and natural ecosystems (NOx) Upper assessment threshold | 70 % of limit value (140 μg/m3, not to be exceeded more than 18 times in any calendar year) | 80 % of limit value (32 μg/m3) | 80 % of critical level (24 μg/m3) Lower assessment threshold | 50 % of limit value (100 μg/m3, not to be exceeded more than 18 times in any calendar year) | 65 % of limit value (26 μg/m3) | 65 % of critical level (19,5 μg/m3)

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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.