1. 1) European Commission (2003) Directive 2003/10/EC of the European Parliament and of the Council of 6th February 2003 on the minimum health and safety requirements regarding exposure of workers to the risks arising from physical agents (noise). Off J Eur Communities L42, 38.
2. 2) Her Majesty’s Stationery Office (HMSO) (2005) The Control of Noise at Work Regulations 2005. Statutory Instrument 2005 No. 1643. HMSO, Norwich, UK.
3. 3) ISO 226 (2003) Acoustics —Normal equal-loudness-level contours. International Organization for Standardization (ISO), Geneva.
4. 4) IEC 61672–1 (2002) Electroacoustics —Sound level meters — Part 1: Specifications. International Electrotechnical Commission (IEC), Geneva.
5. 5) ANSI S1.43 (1997, R 2007) Specifications for Integrating-Averaging Sound Level Meters. American National Standards Institute (ANSI) / Acoustical Society of America (ASA), New York.