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Abbreviations for Air/Gas Monitoring

  • PEL – Permissible Exposure Limit
  • STEL – Short Term Exposure Limit
  • Ceiling – Maximum Peak Level
  • TWA – Time Weighted Average
  • LC50 – Lethal Concentration
  • LD50 – Lethal Dosage
  • IDLH–Immediately Dangerous Life Health
  • AGT – Authorized Gas Tester
  • CH4 – Methane
  • H2S – Hydrogen Sulfide
  • LEL – Lower Explosive Limit
  • UEL – Upper Explosive Limit
  • PPM – Parts Per Million
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