A change in the methodology of noise assessment in protected outdoor environs of buildings as related to health risk assessment
Abstract
The presented article deals with assessment of an effect of the amendment to the international technical standard ISO introduced into the system of Czech technical standards ČSN ISO 1996-2 Acoustics - Description, measurements and environmental noise assessment - Part 2: Determination of environmental noise (further "ČSN"), valid since September 2009, and its impact on a process of health risk assessment (HRA) and health impact assessment (HIA). In addition, the above mentioned standard requires the values measured in a distance of 0,5 upto 2,0 m from the fasade (i.e. values influenced by the sound reverberation from the fasade) which were corrected to reference conditions, i.e. to the noise value in a free-field with elimination of all reverberations except reverberations from the land surface.
Fullfilling conditions given by the standard, this correction is carried out by deduction of a flat correction -3 dB. The article shows the effect of implementation of the new standards on input data (noise descritpors and their values) in acoustic studies used in assessment of health effects.