ORDER
HUGH LAWSON, District Judge.
I. INTRODUCTION
At issue in this case is the adoption and enforcement of workplace-safety exposure levels for four chemical substances—silica, copper, n-propyl bromide ("nPB"), and diesel particulate matter ("DPM"). Plaintiffs are International Brominated Solvents Association ("IBSA"), National Mining Association ("NMA"), AeroSafe Products, Inc., ("AeroSafe"), and Anchor Glass Container Corporation...
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