# The Air Quality Standards (Wales) Regulations 2007, Part 1: Group A pollutants


Reference method
Sampling and analysis of benzene
A pumped sampling method on a sorbent cartridge followed by gas chromatographic determination
Analysis of carbon monoxide
A non-dispersive infra-red spectrometric (NDIR) method
Sampling of lead
The same reference method as for PM10
Analysis of lead
ISO 9855: 1993 Ambient air — Determination of the particulate lead content of aerosols collected in filters. Atomic absorption spectroscopy method
Analysis of nitrogen dioxide and oxides of nitrogen
ISO 7996: 1985 Ambient air — determination of the mass concentrations of nitrogen oxides — chemiluminescence method
Sampling and measurement of PM10
The reference method for the sampling and measurement of PM10 is that described in EN 12341 “Air Quality — Field Test Procedure to Demonstrate Reference Equivalence of Sampling Methods for the PM10 fraction of particulate matter” . The measurement principle is based on the collection on a filter of the PM10 fraction of ambient particulate matter and the gravimetric mass determination
Analysis of sulphur dioxide
ISO/FDIS 10498 (Standard in draft) Ambient air — determination of sulphur dioxide — ultraviolet fluorescence method

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/9/part/1 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-9/part-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.