{
  "url": "https://openlegislation.uk/eu-decision-2017-1442/annex/division-n4/division-3",
  "json_url": "https://openlegislation.uk/eu-decision-2017-1442/annex/division-n4/division-3.json",
  "legislation": "eudn/2017/1442",
  "legislation_title": "Commission Implementing Decision (EU) 2017/1442 of 31 July 2017 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for large combustion plants (notified under document C(2017) 5225) (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-decision-2017-1442",
  "path": "annex/division/n4/division/3",
  "kind": "division",
  "number": null,
  "heading": "BAT-AELs for emissions to air",
  "text": "Emission levels associated with the best available techniques (BAT-AELs) for emissions to air given in these BAT conclusions refer to concentrations, expressed as mass of emitted substance per volume of flue-gas under the following standard conditions: dry gas at a temperature of 273,15 K, and a pressure of 101,3 kPa, and expressed in the units mg/Nm3, μg/Nm3 or ng I-TEQ/Nm3.\nThe monitoring associated with the BAT-AELs for emissions to air is given in BAT 4\nReference conditions for oxygen used to express BAT-AELs in this document are shown in the table given below.\nActivity\nReference oxygen level (OR)\nCombustion of solid fuels\n6 vol-%\nCombustion of solid fuels in combination with liquid and/or gaseous fuels\nWaste co-incineration\nCombustion of liquid and/or gaseous fuels when not taking place in a gas turbine or an engine\n3 vol-%\nCombustion of liquid and/or gaseous fuels when taking place in a gas turbine or an engine\n15 vol-%\nCombustion in IGCC plants\nThe equation for calculating the emission concentration at the reference oxygen level is:\nE R = 21 − O R 21 − O M × E M Where:\nER emission concentration at the reference oxygen level OR;\nOR reference oxygen level in vol- %;\nEM measured emission concentration;\nOM measured oxygen level in vol- %.\nFor averaging periods, the following definitions apply:\nFor any parameter where, due to sampling or analytical limitations, 30-minute measurement is inappropriate, a suitable sampling period is employed. For PCDD/F, a sampling period of 6 to 8 hours is used.\nAveraging period\nDefinition\nDaily average\nAverage over a period of 24 hours of valid hourly averages obtained by continuous measurements\nYearly average\nAverage over a period of one year of valid hourly averages obtained by continuous measurements\nAverage over the sampling period\nAverage value of three consecutive measurements of at least 30 minutes each\nAverage of samples obtained during one year\nAverage of the values obtained during one year of the periodic measurements taken with the monitoring frequency set for each parameter",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "For any parameter where, due to sampling or analytical limitations, 30-minute measurement is inappropriate, a suitable sampling period is employed. For PCDD/F, a sampling period of 6 to 8 hours is used."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudn/2017/1442/annex/division/n4/division/3",
    "retrieved_at": "2026-11-01T15:13:23.628050+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."
}