what is pel stand for
Definition. 1  A Permissible Exposure Limit (PEL) is the maximum amount or concentration of a chemical that a worker may be exposed to under OSHA regulations. 2  A Time-Weighted Average (TWA) is explained below. 3  A VPEL or Vacated PEL is an older PEL set by OSHA but later vacated (retracted) under court order.