{
  "url": "https://openlegislation.uk/air-quality-limit-values-scotland-regulations-2001/regulation-2",
  "json_url": "https://openlegislation.uk/air-quality-limit-values-scotland-regulations-2001/regulation-2.json",
  "legislation": "ssi/2001/224",
  "legislation_title": "The Air Quality Limit Values (Scotland) Regulations 2001",
  "legislation_url": "https://openlegislation.uk/air-quality-limit-values-scotland-regulations-2001",
  "path": "regulation/2",
  "kind": "regulation",
  "number": "2",
  "heading": "Definitions",
  "text": "(1) In these Regulations–\n“agglomeration\" means a zone with a population concentration in excess of 250,000 inhabitants or, where the population concentration is 250,000 inhabitants or less, a population density per km2 for which the Scottish Ministers consider that the need for ambient air to be assessed or managed is justified;\n“alert threshold\" has the meaning given by regulation 8(2);\n“ambient air\" means outdoor air in the troposphere, excluding work places;\n“assessment\" means any method used to measure, calculate, predict or estimate the level of a relevant pollutant in the ambient air;\n“fixed measurements\" means measurements taken at fixed sites either continuously or by random sampling, the number of measurements being sufficiently large to enable the levels observed to be determined;\n“level\" means the concentration of a relevant pollutant in ambient air;\n“limit value\" has the meaning given by regulation 3(1);\n“lower assessment threshold\" has the meaning given by regulation 5(5);\n“margin of tolerance\" means the percentage of the limit value by which this value may be exceeded subject to the conditions laid down in Schedule 1;\n“natural events\" means volcanic eruptions, seismic activities, geothermal activities, wild-land fires, high-wind events or the atmospheric resuspension or transport of natural particles from dry regions;\n“oxides of nitrogen\" means the sum of nitric oxide and nitrogen dioxide added as parts per billion and expressed as nitrogen dioxide in microgrammes per cubic metre;\n“PM2.5\" means particulate matter which passes through a size-selective inlet with a 50% efficiency cut-off at 2.5μm aerodynamic diameter;\n“PM10\" means particulate matter which passes through a size-selective inlet with a 50% efficiency cut-off at 10μm aerodynamic diameter;\n“relevant pollutants\" means sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter and lead;\n“upper assessment threshold\" has the meaning given in regulation 5(5); and\n“zone\" means a part of the territory of Scotland which is designated by Scottish Ministers for the purposes of these Regulations and shown on a map published by the Scottish Executive, Department of Environment, Transport and the Regions, the National Assembly of Wales and Department of Environment Northern Ireland on 19 January 2001, a copy of which is deposited at the offices of the Scottish Executive, Victoria Quay, Edinburgh, EH6 6QQ and displayed on the Scottish Executive website at http://www.scotland.gov.uk/environment/ airquality/publications.asp\n(2) In these Regulations, unless the context otherwise requires, any reference to–\n(a) a numbered Regulation or Schedule is a reference to the Regulation in, or Schedule to, these Regulations bearing that number; and\n(b) a numbered paragraph is a reference to the paragraph in that Regulation or Schedule bearing that number in the Regulation in which the reference appears.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [
    {
      "type": "am (19.1.2003)",
      "affecting": "ssi/2002/556",
      "affecting_title": "The Air Quality Limit Values (Scotland) Amendment Regulations 2002"
    },
    {
      "type": "rev in pt (19.1.2003)",
      "affecting": "ssi/2002/556",
      "affecting_title": "The Air Quality Limit Values (Scotland) Amendment Regulations 2002"
    }
  ],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/ssi/2001/224/regulation/2",
    "retrieved_at": "2026-10-28T22:46:13.462583+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."
}