As part of their provision of support to local authorities for air quality management, Defra and the Devolved Administrations provide a set of centralised QA/QC services, to assist local authorities using diffusive samplers for monitoring of ambient nitrogen dioxide (NO2) as part of their Local Air Quality Management process.
This is aimed at the analytical laboratories that supply and analyse the diffusion tubes and currently comprises:
- Promotion of the independent AIR-PT scheme, operated by LGC Standards and supported by the Health and Safety Laboratory, with yearly assessment against agreed performance criteria. AIR-PT combines two long running PT schemes: LGC Standards STACKS PT scheme and HSL Workplace Analysis Scheme for Proficiency (WASP) PT scheme. For more information about the AIR-PT scheme, please visit the Air & Stack Emissions (AIR PT) website on the LGC Standards website.
- Operation of a field inter-comparison exercise, in which diffusion tubes are co-located with an automatic analyser (from January 2006 this is at a roadside site).
- Provision of quality control standard solutions, free of charge to laboratories that prepare and analyse NO2 diffusion tubes used by local authorities for LAQM purposes.
Summaries of participating laboratories’ performance in the AIR-PT/WASP scheme over the preceding months, prepared by LGC/BV/NPL, are available by clicking on the links below.
Released: July 2022 (PDF, 169 KB, 5 pages)
The AIR PT scheme uses laboratory spiked Palmes type diffusion tubes to test each participating laboratory’s analytical performance on a quarterly basis and continues the format used in the preceding WASP PT scheme. It should be noted that such tubes are not designed to test other parts of the measurement system e.g. sampling.
Released: March 2021 (PDF, 163 KB, 5 pages)
Released: October 2020 (PDF, 166 KB, 5 pages)
Released: November 2019 (PDF, 320 KB, 5 pages)
Released: August 2019 (PDF, 320 KB, 5 pages)
Released: May 2019 (PDF, 320 KB, 5 pages)
Released: February 2019 (PDF, 228 KB, 5 pages)
Released: October 2018 (PDF, 228 KB, 5 pages)
Released: August 2018 (PDF, 228 KB, 5 pages)
Released: March 2018 (PDF, 228 KB, 5 pages)
Released: November 2017 (PDF, 227 KB, 5 pages)
Released: August 2017 (PDF, 227 KB, 5 pages)
To view summaries for previous rounds of the AIR-PT/WASP scheme, please contact the LAQM Helpdesk.