A NIOSH Health Hazard Evaluation report presented findings of an agency investigation at an engine machining plant where employees were exposed to metalworking fluids, or MWFs. The union representing the employees had requested the evaluation because of concerns that exposure to MWFs had caused respiratory symptoms and dermatitis among workers.
NIOSH personnel visited the plant in August 2015 and February 2016. Air sampling conducted during these visits confirmed that MWFs were present at levels below occupational exposure limits. However, published studies have found that workers can develop respiratory symptoms from exposure to MWFs below the NIOSH recommended exposure limit of 0.5 mg/m3.