Occupational Safety and Health Administration's Permissible Exposure Limit

{
  "id": "MLC-T-ENV-019302",
  "term": "Occupational Safety and Health Administration's Permissible Exposure Limit",
  "field": "Environment",
  "definition": "Occupational Safety and Health Administration's permissible exposure limit expressed as a time-weighted average. The PEL is enforced by OSHA; it is the concentration of a substance which must not be exceeded during any 8-hour workshift of a 40-hour workweek. A STEL is measured over a 15-minute period unless noted otherwise, and OSHA ceiling concentrations must not be exceeded during any part of the workday; if instantaneous monitoring is not feasible, the ceiling must be assessed as a 15-minute TWA exposure. In addition, there are a number of substances (e.g., beryllium, ethylene dibromide) that have PEL ceiling values that must not be exceeded except for specified excursions. For example, a \"5-minute maximum peak in any 2 hours\" means that a 5-minute exposure above the ceiling value, but never above the maximum peak, is allowed in any 2 hours during an 8-hour workday. See NIOSH Pocket Guide to Chemical Hazards.",
  "abbreviation": "OSHA PEL",
  "subject": "Air",
  "references": [
    "Health Effects Notebook Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/occupational-safety-and-health-administration-s-permissible-exposure-limit/"
}