# The Air Quality Standards Regulations (Northern Ireland) 2010, Schedule 6: Critical levels for the protection of vegetation

Extent: N.I.

Critical levels for the protection of vegetation
Averaging period
Critical level
Sulphur dioxide:
Calendar year and winter (1 October to 31 March)
20 µg/m3
Oxides of nitrogen:
Calendar year
30 µg/m3 NOx

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Source: https://www.legislation.gov.uk/nisr/2010/188/schedule/6 (the official version)
Page: https://openlegislation.uk/air-quality-standards-regulations-northern-ireland-2010/schedule-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.