Division: Long-term sound level at point R in decibels A (dBA) - 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)

The total sound level in decibels A (dBA) is obtained by summing levels in each frequency band:

L_{Aeq,LT} = 10 \times \lg \sum_{i} 10^{(L_{tot,LT,i} + {AWC}_{f,i}) ∕ 10}

(2.5.11)

where i is the index of the frequency band. AWC is the A-weighting correction according to the international standard IEC 61672-1:2003.

This level L_Aeq,LT constitutes the final result, i.e. the long-term A-weighted sound pressure level at the receiver point on a specific reference time interval (e.g. day or evening, or night or a shorter time during day, evening or night).

Division Long-term sound level at point R in decibels A (dBA)