A small error in the model equation has been identified and was corrected on 28th
April 2009. This error concerned the temperature and pressure correction applied to the reported TEOM concentrations.
This resulted in an underestimation of the TEOMVCM concentration of approximately 4% at background locations;
an analysis of the impact of this error on the 2007 AURN measurements can be seen on the graoh to the left.
Concentrations calculated using the VCM before this date should therefore be recalculated.
To help with this process the correction xls spreadsheets that have been generated using the VCM Web
Portal have been regenerated and can be downloaded from
VCM web portal.
Unfortunately, the details for all the corrections made are not available to us, specifically,
if you made more than one correction in a visit
to the web portal then only the last correction made will have been saved.
We apologise for the inconvenience caused.
This error affects the application of the VCM to TEOM measurements through the VCM web portal.
It does not affected the underlying basis of the VCM and its proven equivalence to the EU reference method.
Item date 01/05/2009
- London Air Quality Network seminar 21st September 2010
- Shortlisted for THE Leadership & Management Award
- Royal Society of Chemistry Conference in London
- Openair newsletter
- Sensor Systems for Environmental Monitoring - call for papers
- Forthcoming IAPSC Conference - London 22nd June
- The impact of airport closures on local air quality
- Site Name Improvement Completion
- Volcanic ash - Update Monday 19th April 2010
- Volcanic ash under observation Update 16/04/2010
- Volcanic ash under observation Update
- Volcanic ash under observation
- Over 6000 active subscribers to the LondonAir iPhone app
- Environmental audit committee report on air quality
- Clearing London’s air - the Mayor’s air quality strategy
- Merton joins the LAQN
- London Air iPhone App 2.0 launched
- Public understanding of air quality
- £2.8 million for ‘Clean air for London’
- New air pollution monitoring site at Sutton
- Environmental Audit Committee
- New NOx analyser at Ealing 8
- Air Quality website for Leicester City Council
- New PM10 at Horseferry Road
- Miniaturization of Air Quality Networks
- London Air iPhone App 2.0
- Staff member in Who's Who 2010
- Site Name improvements
- Chemical Mass Closure Modelling at the Camden 1 - Swiss Cottage Monitoring Site
- EPUK Planning Guidance 2nd Call for Evidence - Mitigation
- London’s air quality compared to the rest of Europe
- Air quality the major challenges - Royal Society of Chemistry conference in London
- Job opportunity within the ERG modelling team
- Air Quality website for Ealing
- Consultation on the Mayor’s Air Quality Strategy
- Job opportunities at ERG
- Recent changes to the way the VCM works
- Particle measurement in Paris
- London Air pollution iPhone update
- Additional AURN Monitoring Station in Eastbourne