Nitrogen Dioxide Diffusion Tubes

Nitrogen dioxide diffusion tubes provide long-term monitoring options with detection limits in the low parts per billion to parts per million range. These cost effective devices do not require specialist skills or time commitment and therefore give the user an efficient method for air quality monitoring.

Tubes are available for:

  • Nitrogen dioxide, (NO2) analysis.
  • Simultaneous monitoring of Nitrogen dioxide and Sulphur dioxide (NO2/SO2).

Sources of Nitrogen oxides:

  • Fuel combustion – power stations, off road equipment, vehicles, (in-vehicle concentrations of NO2 may be higher than measured ambient levels).
  • Biomass burning.
  • Natural processes.

Potential implications of Nitrogen oxides pollution:

  • Involved in ground-level Ozone formation.
  • Respiratory effects.
  • Aggravation of heart disease symptoms.

To discuss your NO2 analysis requirements, please email or call 01962 860331

Nitrogen oxides form quickly from sources emitting fuel combustion products. It has detrimental health implications and is involved in ground-level Ozone production, which causes damage to plants. Monitoring can be conducted in many environments:

  • Outdoor air monitoring – roadside, industrial, natural process.
  • Forest management.
  • Traffic management.
  • Indoor air monitoring – buildings near busy road, in-vehicle concentrations.
  • Monitoring for health purposes.
  • Occupational monitoring (e.g. taxi drivers, bus drivers, machinery operators).

Tube options:

DIF100-20WA – NO2 tube with 20% TEA/Water absorbent
DIF100-50AA – NO2 tube with 50% TEA/Acetone absorbent
DIF500RTU-RA – Combined tube for NO2 and SO2


DIF1000 – Push-in plastic fixing clip
DIF3000 – Circular (drop-in) plastic fixing clip
DIF3001 – Rubber washer for DIF3000
DIF2000 – 360mm fixing strap
DIF2001 – 760mm fixing strap
DIFSHLTR-S – Shelter for up to 3 tubes (optional)

Analysis is carried out in our UKAS accredited laboratories. Results are provided within 10 working days or can be fast-tracked by arrangement.