{
  "url": "https://openlegislation.uk/air-quality-standards-scotland-regulations-2010/schedule-2/paragraph-wrapper1n1",
  "json_url": "https://openlegislation.uk/air-quality-standards-scotland-regulations-2010/schedule-2/paragraph-wrapper1n1.json",
  "legislation": "ssi/2010/204",
  "legislation_title": "The Air Quality Standards (Scotland) Regulations 2010",
  "legislation_url": "https://openlegislation.uk/air-quality-standards-scotland-regulations-2010",
  "path": "schedule/2/paragraph/wrapper1n1",
  "kind": "paragraph",
  "number": null,
  "heading": null,
  "text": "The maximum daily eight hour mean concentration of carbon monoxide must be selected by examining eight hour running averages, calculated from hourly data and updated each hour. Each eight hour average so calculated will be assigned to the day on which it ends, i.e. the first calculation period for any one day will be the period from 1700 hours on the previous day to 0100 hours on that day, the last calculation period for any one day will be the period from 1600 hours to 2400 hours on that day.\nLead\nAveraging period\nLimit value\nCalendar year\n0.5 µg/m3\nPM10\nAveraging period\nLimit value\nOne day\n50 µg/m3, not to be exceeded more than 35 times a calendar year\nCalendar year\n40 µg/m3\nPM2.5\nAveraging period\nLimit value\nMargin of tolerance\nDate by which limit value is to be met\nCalendar year\n25 µg/m3\n20% on 11th June 2008, decreasing on the next 1st January and every 12 months thereafter by equal annual percentages to reach 0% by 1st January 2015\n1st January 2015",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/ssi/2010/204/schedule/2/paragraph/wrapper1n1",
    "retrieved_at": "2026-10-28T21:55:33.792627+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."
}