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NO2 Diffusion Tube Monitoring Calendar

Current Version

Suggested Exposure Periods (2022)
Period Start Date End Date Duration (weeks)
January 5 January 2 February 4
February 2 February 2 March 4
March 2 March 30 March 4
April 30 March 4 May 5
May 4 May 8 June 5
June 8 June 6 July 4
July 6 July 3 August 4
August 3 August 31 August 4
September 31 August 28 September 4
October 28 September 2 November 5
November 2 November 30 November 4
December 30 November 4 January 5

Details

  • The start and end dates of the exposure months are on Wednesdays and exposure periods still consist of 4 or 5 whole weeks, i.e. 28 or 35 days.
  • Tubes should be changed on the specified date. If not tubes may be changed within ±2 days of the due date.
  • The Diffusion Tube Data Processing Tool has been developed to assist local authorities in processing their NO2 diffusion tube monitoring data. The outputs of this tool can be directly uploaded into Diffusion Tube Data Entry System (English non-London local authorities only).
  • The Diffusion Tube Data Processing Tool can accept data from exposure periods other than those above, but data will not be eligible for inclusion in the Air Quality Archive.
  • Please keep a record of site irregularities that may occur in monitoring, for example, building work, changes in traffic flow, etc. This information may be helpful in explaining any unusual results.
  • For a PDF copy of the current calendar, please contact the LAQM Helpdesk.

Previous Version

Suggested Exposure Periods (2021)
Period Start Date End Date Duration (weeks)
January 6 January 3 February 4
February 3 February 3 March 4
March 3 March 31 March 4
April 31 March 5 May 5
May 5 May 2 June 4
June 2 June 30 June 4
July 30 June 4 August 5
August 4 August 1 September 4
September 1 September 29 September 4
October 29 September 3 November 5
November 3 November 1 December 4
December 1 December 5 January 5

Details

For older versions of the Diffusion Tube Monitoring Calendar please contact the LAQM Helpdesk for further assistance.

LAQM Helpdesk
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