Noise Mapping

Disclaimer: It should be noted that the main focus of noise maps is for strategic management of environmental noise, based upon a notional annual average day. They should not be seen as representing what may be measured directly at any location within the map.


Environmental noise means unwanted or harmful outdoor sound created by human activities, including noise emitted by means of transport, road traffic rail traffic, air traffic, and from sites of industrial activity. It is among the most frequent sources of complaint regarding environmental issues in Ireland and throughout Europe, especially in densely populated urban areas and residential areas. The 7th Environmental Action Plan (EAP) includes an objective that noise pollution in the EU has significantly decreased by 2020, moving closer to WHO recommended levels.

The Environmental Noise Directive (END), EC 2002/49/EC, was transposed into Irish Law as Statutory Instrument, S.I. 1401 of 2006, Environmental Noise Regulation 2006. The Directive requires Member States to prepare and publish, every 5 years, noise maps and noise management action plans. The aim of then END is to provide a common framework to avoid, prevent or reduce, on a prioritised basis, the harmful effects of exposure to environmental noise through the preparation of strategic noise maps and the development and implementation of action plans. 

Roles and Responsibilities

The EPA is the national authority for overseeing the implementation of the Regulations and its role includes supervisory, advisory and coordination functions in relation to both noise mapping and action planning, as well as reporting requirements for the purpose of the Directive.

Responsibility for the preparation of the relevant noise maps lies with the Noise Mapping Bodies (NMBs) which include Dublin City Council, Transport Infrastructure Ireland TII (responsible for National roads, LUAS), Local Authorities (LAs), responsible for non-national roads, Irish Rail (heavy rail), Dublin Airport Authority (daa), as well as Fingal, Dún Laoghaire-Rathdown, & South Dublin LAs. The preparation and implementation of the resulting noise action plans occurs at local level and is the responsibility of the Local Authorities.

Strategic Noise Maps

A strategic noise map is designed to assess noise exposure in a given area, resulting from particular noise sources such as roads, railways and airports. Such maps are normally prepared using computer modelling techniques. Such techniques calculate the noise level at specific points resulting from the sound emanating from the source being studied. The modelling software uses source data such as traffic flow, type of road and rail, types of vehicles and speeds.

In accordance with the requirements of the Noise Directive the EPA has made available the strategic noise mapping of major agglomeration airports, major roads and major rail networks, in the form of noise contours for the Lden (day, evening, night) and Lnight (night) periods. A noise map is a graphical representation of the predicted situation with regards to noise in a particular area with different colours representing different noise levels in decibels [dB(A)].

All noise maps are presented in terms of two noise indicators: Lden and Lnight.

  • Lden is the day-evening-night noise indicator and it represents the noise indicator for overall annoyance. It is ‘weighted’ to account for extra annoyance in the evening and night periods. The END defines an Lden threshold of 55 dB for reporting on the numbers of people exposed.
  • Lnight is the night time noise indicator and is used in the assessment of sleep disturbance. An Lnight threshold of 50 dB is defined for reporting on the numbers of people exposed.

These indicators are based on year long averages of the day (07:00-19:00), evening (19:00-23:00) and night (23:00-07:00) time periods. Learn About Data - Noise.

Where can I get this data?

You can view the data using our WebGIS on the Map link, under the Noise group. You can download the data from the EPA Database option of the Get data page, including Metadata and style files (.lyr).

Noise Action Planning

Following the preparation of the noise maps, the relevant Action Planning Authorities (APAs) i.e., the local authorities, are required to prepare noise action plans where the Lden (55 db) and Lnight (50 dB) thresholds have been exceeded. The Directive neither sets limit values for noise exposure, nor does it prescribe measures for inclusion in the action plans.

The action plans are designed to act as a means of managing environmental noise by controlling future noise by planned measures, such as land-use planning, systems engineering for traffic, traffic planning, abatement by sound-insulation measures, and control of noise sources. The EPA has produced guidance for Local Authorities on the content of such plans.

The APAs are required to ensure that the public are given sufficient opportunities to participate in the preparation of the draft plans and that the results of such participation are taken into account in finalising the plans.

Review of noise maps

The noise Regulations require that noise mapping bodies (NMBs) review and, where necessary, revise each strategic noise map every 5 years, or when a material change in environmental noise in the area concerned triggers a revision of the relevant noise action plan. The NMBs undertook strategic noise mapping for the second round in 2012, are currently undertaking a review of the strategic noise maps. The third round of noise mapping will cover the period from 2016 – 2018.

How to access the Round 2 Noise maps

GIS information & explanatory text

The data represented here for download and that on EPA Maps is the 2012 phase of noise mapping, representing the second round of the implementation of the EC Directive 2002/49/EC.

  1. The Noise GIS data for Round 2 (2012) has been published on EPA Maps, in the EDEN environment.
    • EPA Maps- Noise: zoom into street level (double click, or use +/1 symbol on lhs of map) and then wait for the noise maps to upload (~ 1 min).
      • Can then click the legend to choose what you want to see ex. Rd2 Road – Day, RD 2 Rail etc.
      • Hover over North Dublin (Swords) and then click Round 2 Airport – Day.
        • Will then see the contour bands on the noise map.
  2. A Noise data package is available to download from the GeoPortal Get Data section, including metadata and layer symbology files.
    • Files are presented as zipped shapefiles. Where possible, files are presented nationally, as well as on a county by county basis.
    • Documents, metadata and legends are presented for Corine, Soils and Subsoils data: these are common to all counties and only need to be downloaded once.
  3. News items have been added to the GeoPortal to inform site users
      • This geoportal is designed to make data about the environment easier to find, browse and understand. See Maps using our web mapping tools, Get Data directly to download and use in your own GIS systems, Ask and Learn to better understand our data.
      • Regular users of the geoportal can use this short document to help find familiar tools on the new geoportal, and learn what new features we have added.
    • Learn About Data Noise section
      • The EPA has a large GIS database all of which is freely available (either in full or in a generalised version where OSI source material copyright must be protected).
      • To help users get the most from EPA data resources, these pages provide descriptions of the data we have available including the content, currency and fitness for purpose.
    • Latest Releases
      • Keep up-to-date with what datasets the EPA have recently updated here. You can download this data using the GET data part of the GeoPortal.
  4. A Noise WMS (Web Mapping Service) has been made available to all to consume.
    • The following Web Mapping Services (WMSs) are available here. We currently support OGC WMS, WFS and ArcGIS REST services.
  5. Noise data metadata has been published on the ISDE Catalog as Open Data.
    • Irish Spatial Data Exchange (ISDE) – Find Data

Learn More

Live Green: See also Live Green – has a section on noise nuisance.

Advice and guidance publications