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The Air Quality Standards (Wales) Regulations 2007

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Regulation 16(3)(a) Regulation 19(6) Regulation 20(4)

SCHEDULE 9Reference methods

PART 1Group A pollutants

Reference method
Sampling and analysis of benzeneA pumped sampling method on a sorbent cartridge followed by gas chromatographic determination
Analysis of carbon monoxideA non-dispersive infra-red spectrometric (NDIR) method
Sampling of leadThe same reference method as for PM10
Analysis of leadISO 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 nitrogenISO 7996: 1985 Ambient air — determination of the mass concentrations of nitrogen oxides — chemiluminescence method
Sampling and measurement of PM10The 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 dioxideISO/FDIS 10498 (Standard in draft) Ambient air — determination of sulphur dioxide — ultraviolet fluorescence method

PART 2Group B pollutants in ambient air

Reference method
Sampling and analysis of Group B pollutants other than benzo(a)pyrene in ambient airA method based on manual PM10 sampling equivalent to EN 12341, followed by digestion of the samples and analysis by Atomic Absorption Spectrometry or ICP Mass Spectrometry
Benzo(a)pyrene concentrations in ambient airA method based on manual PM10 sampling equivalent to EN 12341

PART 3Ozone

Reference method
Analysis of ozoneUV photometric method (ISO FDIS 13964 or equivalent)
Calibration of ozone instrumentsThe Reference UV photometer method (ISO FDIS 13964, VDI 2468, B1.6 or equivalent)

PART 4Other reference methods

Reference method
Sampling and analysis of polycyclic aromatic hydrocarbons in ambient airA method based on manual PM10 sampling equivalent to EN 12341
Sampling and analysis of mercury in ambient airAn automated method based on Atomic Absorption Spectrometry or Atomic Fluorescence Spectrometry
Sampling and analysis of the deposition of Group B pollutants, mercury, and polycyclic aromatic hydrocarbonsA method based on the exposition of cylindrical deposit gauges with standardised dimensions

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