# The Air Quality Limit Values Regulations 2001, Part II: Reference method for the analysis of nitrogen dioxide and oxides of nitrogen


ISO 7996: 1985 Ambient air—determination of the mass concentrations of nitrogen oxides—chemiluminescence method.

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Source: https://www.legislation.gov.uk/uksi/2001/2315/schedule/6/part/II (the official version)
Page: https://openlegislation.uk/air-quality-limit-values-regulations-2001/schedule-6/part-II
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.