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Workplace exposure. Measurement of exposure by inhalation to chemical agents. Strategy for testing compliance with occupational exposure limit values Ingestion-build-276583 The mandatory requirements apply toWhat is BS EN 689 about? BS EN 689 is an international standard that covers the measurement of exposure by inhalation to chemical agents. BS EN 689 discusses workplace exposure in compliance with occupational exposure limit values. It specifies a strategy to perform representative measurements of exposure by inhalation to chemical agents in order to demonstrate compliance with occupational exposure limit values (OELVs). To assess the exposure of