Air quality monitoring - NO2 diffusion tubes

NO₂ diffusion tubes are used for ambient air monitoring within the district.

They can be an excellent tool for any pollution assessment survey or on-going study. They are capable of providing long term assessments for modelling or determining air management locations at a low cost.

They consist of an acrylic tube fitted with a coloured and a white thermoplastic rubber cap. The coloured cap contains the absorbent with Triethanolamine. This reacts with Nitrogen Dioxide molecules in the air.

This reaction occures at a known rate defined by the concentration of Nitrogen Dioxide in the air. The concentrations of Nitrite ions in the Triethanolamine - and hence NO₂ chemically absorbed - are quantitatively determined by UV/ Visible Spectrophotometry with reference to a calibration curve derived from the analysis of standard nitrite solutions.

Tube dimensions : 71mm length x 11mm internal diameter

Data obtained from the diffusion tubes:

• 2023 Annual Status Report - Appendix C1 Diffusion Tube DPT (Unknown File Type, 6.69 Mb)
• 2022 Air Quality Annual Status Report - Appendix C1 Diffusion_Tube_Data (Unknown File Type, 6.89 Mb)
• 2021 Air Quality Annual Status Report - Appendix C1 Diffusion_Tube_Data (Unknown File Type, 5.29 Mb)
• Air Quality NO2 Diffusion Tube Monitoring Data 2020 (Excel Spreadsheet, 4.94 Mb)
• Air Quality NO2 Diffusion Tube Monitoring Data 2019 (Excel Spreadsheet, 23.21 Mb)
• Air Quality NO2 Diffusion Tube Monitoring Data 2018 (Excel Spreadsheet, 6.14 Mb)
• Air Quality NO2 Diffusion Tube Monitoring Data 2017 (Excel Spreadsheet, 6.09 Mb)
• Air Quality NO2 Diffusion Tube Monitoring Data 2016 (Excel Spreadsheet, 6.07 Mb)
• Air Quality No2 Diffusion Tube Monitoring Data 2015 (Excel Spreadsheet, 6.09 Mb)
• Air quality no2 diffusion tube monitoring data 2014 (Excel Spreadsheet, 6.02 Mb)
• Air Quality No2 Diffusion Tube Monitoring Data 2013 (Excel Spreadsheet, 0.28 Mb)
• Air Quality No2 Diffusion Tube Monitoring Data 2012 (Excel Spreadsheet, 0.29 Mb)
• Air Quality No2 Diffusion Tube Monitoring Data 2011 (Excel Spreadsheet, 1.73 Mb)
• Air Quality No2 Diffusion Tube Monitoring Data 2010 (Excel Spreadsheet, 1.74 Mb)
• Air Quality No2 Diffusion Tube Monitoring Data 2009 (Excel Spreadsheet, 1.87 Mb)
• Air Quality No2 Diffusion Tube Monitoring Data 2008 (Excel Spreadsheet, 1.9 Mb)
• Air Quality No2 Diffusion Tube Monitoring Data 2007 (Excel Spreadsheet, 1.86 Mb)
• Air Quality No2 Diffusion Tube Monitoring Data 2006 (Excel Spreadsheet, 0.1 Mb)
• Air Quality No2 Diffusion Tube Monitoring Data 2005 (Excel Spreadsheet, 0.54 Mb)