# The Air Quality Standards (Wales) Regulations 2007, Paragraph 4: Requirements for objective estimation techniques


Where objective estimation techniques are used, the uncertainty must not exceed 100%.

---
Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/7/paragraph/4 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-7/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.