{
  "url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-9/part-1",
  "json_url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-9/part-1.json",
  "legislation": "wsi/2007/717",
  "legislation_title": "The Air Quality Standards (Wales) Regulations 2007",
  "legislation_url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007",
  "path": "schedule/9/part/1",
  "kind": "part",
  "number": "1",
  "heading": "Group A pollutants",
  "text": "Reference method\nSampling and analysis of benzene\nA pumped sampling method on a sorbent cartridge followed by gas chromatographic determination\nAnalysis of carbon monoxide\nA non-dispersive infra-red spectrometric (NDIR) method\nSampling of lead\nThe same reference method as for PM10\nAnalysis of lead\nISO 9855: 1993 Ambient air — Determination of the particulate lead content of aerosols collected in filters. Atomic absorption spectroscopy method\nAnalysis of nitrogen dioxide and oxides of nitrogen\nISO 7996: 1985 Ambient air — determination of the mass concentrations of nitrogen oxides — chemiluminescence method\nSampling and measurement of PM10\nThe 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\nAnalysis of sulphur dioxide\nISO/FDIS 10498 (Standard in draft) Ambient air — determination of sulphur dioxide — ultraviolet fluorescence method",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2007/717/schedule/9/part/1",
    "retrieved_at": "2026-10-29T00:01:33.213395+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}