Initial questions or concerns about chemical or other exposures in your job should be referred to your supervisor, Safety Officer or safety liaison.  An assessment of the chemicals and exposure conditions may include a review of Safety Data Sheets and other information, with subsequent evaluation by EHS.  The evaluation may include exposure sampling or testing with reference to exposure standards such as those established by OSHA (Permissible Exposure Limits) or the American Conference of Governmental Industrial Hygienists (Threshold Limit Values), to determine if further controls are needed to reduce any exposures.