Nitrogen Dioxide Diffusion Tubes

For NO2 we offer more than 1 type of tube that are suitable for passive monitoring of Nitrogen Dioxide:

  • NO2 Standard
  • No2 Filter
  • NO2 Acetone
  • NO2/SO2 combined


Sources of Nitrogen Dioxides:

  • 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 Dioxides pollution:

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


For more information select the downloads option below to download a copy of our instructions or techsheets for these tubes.


The NO2 Acetone and NO2/SO2 combined tubes cannot be shipped outside the UK without an export license – Gradko is in no way affiliated with obtaining export licenses. 

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).

DIF100-20WA – Supply and analysis of Nitrogen Dioxide (20% TEA/Water) diffusion tube.

DIF100-20Filter – Supply and analysis of Nitrogen Dioxide (20% TEA/Water with Filter) diffusion tube

DIF100-50AA – Supply and analysis of Nitrogen Dioxide (50% TEA/Acetone) diffusion tube.

DIF500RTU-RA – Supply and analysis of NO2/SO2 combined diffusion tube.


Tube holders sold separately:

DIF-1000 – Plastic fixing clip

DIF-2000 – 360 mm fixing strap

DIF-2001 – 760 mm fixing strap

DIFSHLTR-S – Shelter for 3 tubes


Analysis is carried out in our UKAS accredited laboratories. Results are provided within 10 working days or can be pre-booked for fast track.

Featured Product

Washers - Pack of 10

These washers fit around the diffusion tubes allowing them to sit comfortable inside our circular clips.

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