# The Air Quality Standards (Scotland) Regulations 2010, Schedule 2: Limit values


Sulphur dioxide
Averaging period
Limit value
One hour
350 μg/m3 not to be exceeded more than 24 times a calendar year
One day
125 μg/m3 not to be exceeded more than 3 times a calendar year
Nitrogen dioxide
Averaging period
Limit value
One hour
200 μg/m3 not to be exceeded more than 18 times a calendar year
Calendar year
40 μg/m3
Benzene
Averaging period
Limit value
Calendar year
5 µg/m3
Carbon monoxide
Averaging period
Limit value
Maximum daily eight hour mean
10 mg/m3

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Source: https://www.legislation.gov.uk/ssi/2010/204/schedule/2 (the official version)
Page: https://openlegislation.uk/air-quality-standards-scotland-regulations-2010/schedule-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.