{
  "url": "https://openlegislation.uk/eu-directive-2015-996/annex/division-ASSESSMENT/division-2/division-2.1/division-2.1.1",
  "json_url": "https://openlegislation.uk/eu-directive-2015-996/annex/division-ASSESSMENT/division-2/division-2.1/division-2.1.1.json",
  "legislation": "eudr/2015/996",
  "legislation_title": "Commission Directive (EU) 2015/996 of 19 May 2015 establishing common noise assessment methods according to Directive 2002/49/EC of the European Parliament and of the Council (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-directive-2015-996",
  "path": "annex/division/ASSESSMENT/division/2/division/2.1/division/2.1.1",
  "kind": "division",
  "number": "2.1.1",
  "heading": "Indicators, frequency range and band definitions",
  "text": "Noise calculations shall be defined in the frequency range from 63 Hz to 8 kHz. Frequency band results shall be provided at the corresponding frequency interval.\nCalculations are performed in octave bands for road traffic, railway traffic and industrial noise, except for the railway noise source sound power, that uses third octave bands. For road traffic, railway traffic and industrial noise, based on these octave band results, the A-weighted long term average sound pressure level for the day, evening and night period, as defined in Annex I and referred to in Art. 5 of Directive 2002/49/EC, is computed by summation over all frequencies:\nL Aeq,T = 10 × lg ∑ i = 1 10 L eq,T,i + A i ∕ 10\n(2.1.1)\nwhere\nAi denotes the A-weighting correction according to IEC 61672-1\ni = frequency band index\nand T is the time period corresponding to day, evening or night.\nNoise parameters:\nLp\nInstantaneous sound pressure level\n[dB]\n(re. 2 10–5 Pa)\nLAeq,LT\nGlobal long-term sound level LAeq due to all sources and image sources at point R\n[dB]\n(re. 2 10–5 Pa)\nLW\n‘In situ’ sound power level of a point source (moving or steady)\n[dB]\n(re. 10–12 W)\nLW,i,dir\nDirectional ‘in situ’ sound power level for the i-th frequency band\n[dB]\n(re. 10–12 W)\nLW′\nAverage ‘in situ’ sound power level per metre of source line\n[dB/m]\n(re. 10–12 W)\nOther physical parameters:\np\nr.m.s. of the instantaneous sound pressure\n[Pa]\np 0\nReference sound pressure = 2 10–5 Pa\n[Pa]\nW 0\nReference sound power = 10–12 W\n[watt]",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudr/2015/996/annex/division/ASSESSMENT/division/2/division/2.1/division/2.1.1",
    "retrieved_at": "2026-11-01T15:21:38.862218+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."
}