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Table of Occupational Exposure Limit values (in mg/m3) The following table shows the Occupational Exposure Limits (OEL) in mg/m3 for quartz, cristobalite and tridymite in application in European countries Country Austria Belgium Denmark Finland France Germany Greece Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom OEL Name Maximale ArbeitsplatzKoncentration Adopted by Bundesministerium fur Arbeit und Soziales Threshold Limit Value Ministere de l'Emploi et du Travail Direktoratet fot Arbeidstilsvnet Occupational Exposure Standard Empoussierage de reference Valeur limite de Movenne d'Exposition National Board of Labour Protection Ministere de l'Industrie (RGIE) Ministere du Travail Grenzwert nach TRGS 900 Threshold Limit Value Grenzwert nach TRGS 900 Maximaal Aanvarde Concentratie Administrative Normer (8hTWA) for Forurensing I Arbeidsmilj0et Bundesministerium fur Arbeit Legislation for mining activities 2002 Code of Practice for the Safety, Health & Welfare at Work (CoP) Associazone Italiana Degli Igienisti Industriali Bundesministerium fur Arbeit Ministerie van Sociale Zaken en Werkgelegenheid Direktoratet for Arbeidstilsynet Threshold Limit Value Instituto Portuges da Qualidade, Hygiene & Safety at Workplace Valores Limites Instituto Nacional de Seguridad e Higiene en el Trabaio Instrucciones de Tecnicas Complementarias (ITC) Reglamento General de Normas Basicas de Seguridad Minera Yrkeshvgieniska Gransvarden Valeur limite de Movenne d'Exposition Maximum Exposure Limit National Board of Occupational Safety and Health Health & Safety Executive Quartz (q) 0,15 0,1 0,1 0,2 5 or 25k/Q 0,1 0,15 0,1 0,05 0,05 0,15 0,075 0,1 0,1 0.1 0,1 5 or 25k/Q 0,1 0,15 0,3 Cristobalite (c) 0,15 0,05 0,05 0,1 Tridymite (t) 0,15 0,05 0,05 01 0,05 0,15 0,05 0,05 0,05 0,15 0,075 0,05 0,05 0,05 0,15 0,05 0,05 0,05 0,15 0,075 0,05 0,05 0,05 0,05 0,05 0,15 0,3 0,05 0,15 03 Q : quartz percentage Source : Adapted from IMA-Europe Date : August 2005, updated version available at http://www.ima-eu.org/en/silhsefacts.html OELs are applicable to 100 % quartz, cristobalite or tridymite. Some countries have special rules for mixed dust, e.g. in France the following equation is applied: Cns/5 + Cq/0.1 + Cc/0.05 +Ct/0.05 < 1 (C = mean concentration, ns = non silicogen) k=1