The impacts of the measures are determined by comparing the number of people and homes seriously affected by aircraft noise in the situation without the measures (the baseline) with the situation with the measures. For the sake of consistency, the same baseline is used as in the Balanced Approach procedure. The changes in traffic that have occurred after the measures came into effect and can be attributed to the measures are then projected onto the baseline to obtain the situation with the measures. More information about the methodology can be found in the Action Plan.

The effects are calculated for an entire year, because the measures may not have reached their full potential by 1 November 2025 and the impacts may differ between the summer and winter seasons. The full impacts can therefore only be definitively determined as of 1 November 2026. During the year, the effects will be monitored at three points in time – 1 November 2025, 1 April 2026 and 1 November 2026 – to gain insight into whether the measures are having the intended impacts.