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Article R4412-154 of the French Labour Code

Where the risk assessment identifies the simultaneous presence of respirable dusts containing crystalline silica and other non-silicogenic respirable dusts, the occupational exposure limit value for the mixture shall be determined by the following formula:

Cns/5 + Cq/0.1 + Cc/0.05 + Ct/0.05 less than or equal to 1

Original in French 🇫🇷
Article R4412-154

Lorsque l’évaluation des risques met en évidence la présence simultanée de poussières alvéolaires contenant de la silice cristalline et d’autres poussières alvéolaires non silicogènes, la valeur limite d’exposition professionnelle correspondant au mélange est fixée par la formule suivante :

Cns/5 + Cq/0,1 + Cc/0,05 + Ct/0,05 inférieur ou égal à 1

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