EU Directive 2002/49/EC, transposed into Irish law by the European Communities (Environmental Noise) Regulations 2018 to 2021, calls for the development of strategic noise maps and noise action plans for major roads, railways, airports and agglomerations.
- Lden - The day - evening - night level is a noise indicator for overall annoyance based upon annual average A-weighted long-term sound over 24 hours with a 5dB(A) penalty for evening noise (19:00 – 23:00) and a 10 dB(A) penalty for night time noise (23:00 – 07:00). Lden noise levels above the threshold of 55dB are required to be reported to the European Commission.
- Lnight – The night level is a noise indicator for sleep disturbance based upon annual average A-weighted long-term sound over the night period (23:00 – 07:00). Lnight noise levels above the threshold of 50dB are required to be reported to the European Commission.
Noise levels that are at or above the noise indicator thresholds set out above are presented at 5 dB contours, i.e. there are no contours representing values below the required reporting thresholds included on the maps.
The noise contours are not based on measurements but have been prepared using computer modelling in-line with a common noise assessment methodology adopted by the European Commission in line with Article 6.2 of the EC Directive 2002/49/EC and brought into effect through Commission Directive (EU) 2015/996.
The new common methodology is called CNOSSOS – EU and further details can be found at this link.
Noise Action Plans
National Strategic Noise Maps
Strategic Noise Mapping 2017 Lden Web Map
Strategic Noise Mapping 2017 Lnight Web Map
Strategic Noise Mapping 2012 Lden Web Map
Strategic Noise Mapping 2012 Lnight Web Map
Strategic Noise Maps
- To view the National Strategic Noise Map, please click here.