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 diffusion tubes are intended for use for periods of between 2-4 weeks before they must be returned to Gradko for analysis. They have a total shelf life of 12 weeks which includes the time taken to analyse the tubes upon their return to our laboratory.

Tubes should be placed several centimeters out from a wall or other structure, ideally at head height, in an area of normal air flow. Please look at our technical data sheets and instruction sheets which can be downloaded from the technical support area of our Environmental section on our website.

These tubes are designed to be used in conjunction with our accessories for supporting the tubes, these can be found on our shop also. If you are in any doubt about whether these are suitable or which type of tube you require please contact us directly for technical advice.

Gradko provide an analytical service only and cannot provide any interpretation of the results nor can Gradko advise on how to plan and conduct a sampling program. If you do require these services we recommend contacting an air quality professional before making a purchase.

To place an order for Spain, please contact us at for details of our Spanish distributor.