We have therefore exceeded our target to date.( Review of OELS Together with a review of our OELs for silica, nickel and acid mist, in FY2016 we established a new internal OEL for DPM, setting the limit as low as technically feasible with an interim requirement of 0.03 milligrams per cubic metre (mg/m3) in our underground operations (reduced from 0.1 mg/m3).