Glossary
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The sound level that is a composite of different airborne sounds from many sources far away from and near the point of measurement. The CSL does include industrial components and must be measured with them, but it should exclude abnormal noise events. The CSL is used to determine whether a facility is in compliance with this directive. Also see Representative conditions.
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"Noise is one of the most important sources of environmental nuisance and a hazard to human health and welfare and that it is increasing in time and space."
Organization for Economic Co-operation and Development (OECD)