# The Air Quality Limit Values (Wales) Regulations 2002, Paragraph

Extent: E+W

Averaging period
Limit value
Margin of tolerance
Date by which limit value is to be met
Limit value for the protection of human health
Maximum daily 8-hour mean
10mg/m3
4 mg/m3 on 1st January 2003, reducing every 12 months thereafter by 2 mg/m3 to reach 0 mg/m3 by 1 January 2005
1 January 2005

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Source: https://www.legislation.gov.uk/wsi/2002/3183/schedule/1/part/VI/paragraph/wrapper1n1 (the official version)
Page: https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002/schedule-1/part-VI/paragraph-wrapper1n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.