# The Air Quality Limit Values (Scotland) Regulations 2001, Paragraph


Averaging period
Limit value
Margin of tolerance
Date by which limit value is to be met
1.24-hour limit value for the production of human health
24 hours
50μg/m3 PM10 not to be exceeded more than 7 times a calendar year
To be derived from date and to be equivalent to Stage 1 limit value
1st January 2010
2.Annual limit value for the protection of human health
Calendar year
20μg/m3 PM10
50% on 1st January 2005 reducing every 12 months thereafter by equal percentages to reach 0% by 1st January 2010
1st January 2010

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Source: https://www.legislation.gov.uk/ssi/2001/224/schedule/2/part/I/paragraph/wrapper2n1 (the official version)
Page: https://openlegislation.uk/air-quality-limit-values-scotland-regulations-2001/schedule-2/part-I/paragraph-wrapper2n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.