No L 177/22 Official Journal of the European Communities 5.7.91 (Acts whose publication is not obligatory) COMMISSION COMMISSION DIRECTIVE 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 (91/322/EEC) THE COMMISSION OF THE EUROPEAN COMMUNITIES, Having regard to the Treaty establishing the European Economic Community, Having regard to Council Directive 80/1107/EEC of 27 November 1980 on the protection of workers from the risks related to exposure to chemical, physical and bio- logical agents at work ("), as last amended by Directive 88/642/EEC (9, and in particular the first subparagraph of Article 8 (4) thereof, Having regard to the opinion of the Advisory Committee on Safety, Hygiene and Health Protection at Work, Whereas the third subparagraph of Article 8 (4) of Direc- tive 80/1107/EEC states that indicative limit values shall reflect expert evaluations based on scientific data; Whereas the aim of fixing these values is the harmoniza- tion of conditions in this area, while maintaining the improvements made ; ' Whereas the Directive constitutes a practical step towards the achievement of the social dimension of the internal market ; () OJ No L 327, 3. 12. 1980, p. 8. () OJ No L 356, 24. 12. 1988, p. 74. Whereas occupational exposure limit values should be regarded as an important part of the overall approach to ensuring the protection of the health of workers at the workplace ; Whereas an initial list of occupational exposure limit values can be established for agents for which similar values exist in the Member States, giving priority to agents which are found at places of work and are likely to have an effect on the health of workers ; whereas this list can be based on existing scientific data as far as the effects on health are concerned, although for certain agents these data are very limited ; Whereas in addition it may be necessary tp establish occupational exposure limit values for shorter periods taking into account the effects arising from short term exposure ; Whereas a reference method covering, infer'alia, assess- ment of exposure and measuring strategy for occupational exposure limit values is contained in Directive 80/1107/EEC; Whereas, in view of the importance of obtaining reliable measurements of exposure in relation to occupational exposure limit values, it may be necessary in the future to establish appropriate reference methods; Whereas occupational exposure limit values need to be kept under review and will need to be revised if new scientific data indicate that they are no longer valid;