1. American Conference on Industrial Hygiene (ACGIH) (2010),2010
2. Belgium, 2006. De federale minister van Werk (2006). Koninklijk besluit van 11 maart 2002 betreffende de bescherming van de gezondheid en de veiligheid van de werknemers tegen de risico’s van chemische agentia op het werk (B.S. 14.3.2002, Ed.2) BIJLAGE I Grenswaarden voor beroepsmatige blootstelling. Available from: (accessed 02.05.2011).
3. Denmark, 2007. The Danish Working Environment Authority (2007). Grænseværdier for stoffer og materialer At-vejledning C.0.1 (2007). Rettelsesblad, marts 2008. Available from: (accessed 02.05.2011).
4. EU, 1991. Commission Directive 91/322/EEC of 29 May 1991 on establishing indicative limit values by implementing Council Directive 80/1107/EEC on the protection of workers from the risks related to exposure to chemical, physical and biological agents at work.
5. EU, 1996. Commission Directive 96/94/EC of 18 December 1996 establishing a second list of indicative limit values in implementation of Council Directive 80/1107/EEC on the protection of workers from the risks related to exposure to chemical, physical and biological agents at work.