Noise Round 4 Airport National (Lden)

Major airports were identified under the Regulaitons as those airports exceeding the threshold of 50,000 aircraft movements per year during 2021. The dB value represents the annual average Lden indicator value in decibels over 24 hours.

The values are calculated at a height of 4.0m above local terrain, not measured, and should be treated with caution when looking at specific locations. The strategic noise mapping of the major airports was undertaken by Dublin Airport Authority. The outputs of the Round 4 noise mapping exercise were generated using a new common noise assessment method for Europe (CNOSSOS-EU), as set out in the revised Annex II of Directive 2002/49/EC, and they are not directly comparable to any strategic noise maps previously generated under Rounds 1 to 3, as these revised methods calculate noise emissions, propagation and residential population exposure differently from the methods used in previous rounds.