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


Sulphur dioxide
Averaging period
Critical level
Calendar year and winter (1 October to 31 March)
20 µg/m3
Oxides of Nitrogen
Averaging period
Critical level
Calendar year
30 µg/m3 NOx

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Source: https://www.legislation.gov.uk/ssi/2010/204/schedule/6 (the official version)
Page: https://openlegislation.uk/air-quality-standards-scotland-regulations-2010/schedule-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.