# 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, Annex XIII: CRITICAL LEVELS FOR THE PROTECTION OF VEGETATION

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

Averaging period
Critical level
Margin of tolerance
Sulphur dioxide
Calendar year and winter (1 October to 31 March)
20 μg/m3
None
Oxides of nitrogen
Calendar year
30 μg/m3 NOx
None

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