# The Air Quality Standards (Wales) Regulations 2007, Schedule 4: Assessment thresholds




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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/4 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.