Answer: Yes. OSHA can cite the food company per 29 CFR 1910.145 for failure to post an accident prevention sign, such as a danger or safety instruction sign. Danger signs indicate immediate danger and that special precautions are necessary. Safety instruction signs shall be used where there is a need for general instructions and suggestions relative to safety measures.

According to 1910.145, signs are required to define specific hazards of a nature such that failure to designate them may lead to accidental injury to workers or the public, or both, or to property damage. In this case, if failure to designate the presence of combustible dust may lead to injury or property damage, a sign is required. Combustible dust creates a fire and explosion hazard.