# 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, Division 2: Nitrogen dioxide and oxides of nitrogen

Extent: E+W+S+N.I.

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)

---
Source: https://www.legislation.gov.uk/eudr/2008/50/annex/II/division/A/division/2 (the official version)
Page: https://openlegislation.uk/eu-directive-2008-50/annex-II/division-A/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.