{
  "url": "https://openlegislation.uk/air-quality-standards-regulations-2010/schedule-2",
  "json_url": "https://openlegislation.uk/air-quality-standards-regulations-2010/schedule-2.json",
  "legislation": "uksi/2010/1001",
  "legislation_title": "The Air Quality Standards Regulations 2010",
  "legislation_url": "https://openlegislation.uk/air-quality-standards-regulations-2010",
  "path": "schedule/2",
  "kind": "schedule",
  "number": "2",
  "heading": "Limit values",
  "text": "Sulphur dioxide\nAveraging period\nLimit value\nOne hour\n350 μg/m3 not to be exceeded more than 24 times a calendar year\nOne day\n125 μg/m3 not to be exceeded more than 3 times a calendar year\nNitrogen dioxide\nAveraging period\nLimit value\nOne hour\n200 μg/m3 not to be exceeded more than 18 times a calendar year\nCalendar year\n40 μg/m3\nBenzene\nAveraging period\nLimit value\nCalendar year\n5 µg/m3\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\nDate by which limit value is to be met\nCalendar year\n20 μg/m3\n1st January 2020\nCarbon monoxide\n1 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, that is, the first calculation period for any one day will be from 17:00 on the previous day to 01:00 on that day, the last calculation period for any one day will be the period from 16:00 to 24:00 on that day.\nAveraging period\nLimit value\nMaximum eight hour daily mean1\n10 mg/m3",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Words in Sch. 2 substituted (10.12.2020) by The Environment (Miscellaneous Amendments) (EU Exit) Regulations 2020 (S.I. 2020/1313), regs. 1(2), 2"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2010/1001/schedule/2",
    "retrieved_at": "2026-10-29T02:45:20.255559+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."
}