Ambient Air Quality

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Thermo Scientific TEOM 1405
Ambient Air Monitor

Take continuous direct mass measurements of particulates using a tapered element oscillating microbalance (TEOM) with the Thermo Scientific™ 1405 TEOM™ Continuous Ambient Particulate Monitor. This monitor measures TSP, PM-10, PM-2.5, and PM-1 airborne particulates with excellent short term precision. Self-referencing, NIST traceable direct mass measurement. The TEOM 1405 Monitor is a real-time device used for measuring the particulate matter mass concentration of particulate matter.

TEOM instruments are the only filter-based mass monitors that measure the mass of particulate matter suspended in gas streams in real time. This is made possible through the use of an inertial mass transducer patented in the U.S. and internationally by Thermo Scientific. The monitor is ideally suited for applications demanding real-time air particulate matter monitoring in outdoor, indoor or industrial settings.

It calculates mass concentration, mass rate and the total mass accumulation on the TEOM filter under the following conditions:
  • Flow rate through sample inlet 16.7 l/min (1 m3/hr)
  • Main sample flow rate 3 l/min
  • Temperature of sample stream 30º C
  • Particulate matter mass concentration (less than 5 μg/m3 to several g/m3)
The TEOM 1405 Monitor is a true “gravimetric” instrument that draws (then heats) ambient air through a filter at constant flow rate, continuously weighing the filter and calculating near real-time mass concentrations of particulate matter. In addition, the instrument computes the 1-hour, 8-hour, 12-hour and 24-hour averages of the mass concentration of particulate.

Quanity: TBD

For equipment availability, please contact:
Farshid Farsi
US EPA - TAMS Center
4220 S. Maryland Parkway, Bldg C
Las Vegas, NV 89119

  • PM 1
  • PM 2.5
  • PM 10
  • TSP
  • Air quality monitoring networks, including background sites
  • Special studies and supersites
  • Routine input for air quality index
  • Remediation projects (Superfund, hazardous waste)
  • Indoor air, exposure chamber, and industrial hygiene measurements
  • In and around industrial and material handling facilities

For technical equipment support and troubleshooting, please contact:
Chris Lee, TAMS Co-Director

For quality assurance support, please contact:
Melinda Ronca-Battista


Kent Bartholomew
If you would like to view tribal examples of quality assurance project plans, standard operating procedures or other technical supporting documents, please visit: