{
  "url": "https://openlegislation.uk/eu-directive-2015-996/annex/division-ASSESSMENT/division-2/division-2.5/division-2.5.5/division-1",
  "json_url": "https://openlegislation.uk/eu-directive-2015-996/annex/division-ASSESSMENT/division-2/division-2.5/division-2.5.5/division-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/2.5/division/2.5.5/division/1",
  "kind": "division",
  "number": null,
  "heading": "Sound level in favourable conditions (LF) for a path (S,R)",
  "text": "LF = LW,0,dir – AF\n(2.5.5)\nThe term AF represents the total attenuation along the propagation path in favourable conditions, and is broken down as follows:\nLF = Adiv + Aatm + Aboundary,F\n(2.5.6)\nwhere\nAdiv is the attenuation due to geometrical divergence;\nAatm is the attenuation due to atmospheric absorption;\nAboundary,F is the attenuation due to the boundary of the propagation medium in favourable conditions. It may contain the following terms:\nAground,F which is the attenuation due to the ground in favourable conditions;\nAdif,F which is the attenuation due to diffraction in favourable conditions.\nFor a given path and frequency band, the following two scenarios are possible:\neither Aground,F is calculated with no diffraction (Adif,F = 0 dB) and Aboundary,F = Aground,F ;\nor Adif,F is calculated. The ground effect is taken into account in the Adif,F equation itself (Aground,F = 0 dB). This therefore gives Aboundary,F = Adif,F .",
  "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/2.5/division/2.5.5/division/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."
}