US EPA Method 25

This method is typically used for sOURCE and destruction efficiency TESTING

This method determines the concentration of volatile organic compounds (VOC) measured as total gaseous non-methane organics (TGNMO) and reported as carbon, in stationary source emissions. This method is not applicable for the determination of organic particulate matter.

Method 25 analyzes for carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), and non-methane organic compounds (NMOC) with a range of concentrations of 50ppmC to 50,000ppmC.

For high moisture sources, a two trap method can be used to remove moisture and prevent ice blockage by including a wet ice SCAQMD/California style trap in series prior to the dry ice trap.

equipment needed

  • Heated sample train with probe
  • U shaped trap
  • 4, 6, or 8L tank
  • Vacuum pump
  • Shipping cooler for traps


Method Improvements




client provided equipment

  • Field barometer
  • Manometer
  • Dry Ice