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QA/QC of Scottish Air Quality Data. Ken Stevenson. Project Overview. Aim : To have all of the air quality data collected in Scotland in one accessible website Duration: 3-year contract Key elements: Data from National Network and LA sites in Scotland All quality assured to same standard

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Presentation Transcript
project overview
Project Overview

Aim :

  • To have all of the air quality data collected in Scotland in one accessible website

Duration:

  • 3-year contract

Key elements:

  • Data from National Network and LA sites in Scotland
  • All quality assured to same standard
  • Data available via open access website
  • Long-term trend analysis
  • Mapping of pollutants throughout Scotland
  • Newsletter and Annual Report
  • Annual Seminar
qa qc of scottish sites
QA/QC of Scottish sites
  • Current Situation –
  • Total 60 Sites on Scottish website (up from 44 in 2007)
  • 32 sites operated under this project
  • 15 AURN
  • 13 funded by LAs or Scottish Grant Scheme
additional sites to be added
Additional sites to be added
  • 5 sites temporily closed for relocation or roadworks
  • Fife Cupar
  • Edinburgh Haymarket
  • Aberdeen Market St
  • N. Lanarkshire, Harthill
  • N Lanarkshire, Ellis Road
  • 4 sites still to join the database
  • East Lothian, Mussleburgh North High St – In progress
  • East Renfrewshire, Clarkston – In progress
  • Shetland Stanley Hill – telemetry issues
  • North Ayrshire, Irvine – New site recently installed

This will bring the total to 69 sites on the Scottish Database.

qa qc
QA/QC
  • Daily collection of data from each site
  • Scaling of data from last calibration results
  • Daily checking of data
  • On-going data update as new information becomes available
  • Site audits
  • Collection and storage of all calibrations and service records etc
  • 6-monthly data ratification
  • “Quality Circle” data review
  • Update of ratified data to the website
  • Assistance to LAs where-ever possible
6 monthly site intercalibration and audit
6-monthly site intercalibration and audit
  • AEA visits every site every 6-months to undertake the intercalibration and site audit
  • Check Analysers
  • Check Calibration Gases
  • Site Infrastructure
  • Local Operator

0401

slide8

Problems found at 2008/9 audits

  • Cylinders:- 4 NO cylinders
  • 1 SO2 Cylinder
  • PM Analysers:- 2 Ko out by more than 2.5% (2.8 – 4.8%)
  • 5 Main flows out (12 – 20%)
  • 6 Leak test failed
  • 1 Aux flow out (26%)
  • Gas Analysers 1 CO analyser fail leak test
measuring pm
Measuring PM

PM10

“Equivalent Analysers”

  • Partisol (with emfab filters)
  • Beta (Met One) unheated, with correction factor
  • Beta (Opsis SM200) with correction factor
  • TEOM FDMS (not with C drier)
  • (TEOM with Volatile Correction Model)
partisol
Partisol
  • Automated sampling device - size-selected particulate matter on filters for later analysis.
  • Unattended operation for up to two weeks between site visits.
  • Filters are equilibrated, at 20° C and 50% R.H., for 48 hours - before and again after sampling.
  • Filters are carefully weighed using precision microbalances.
  • Concentration is a function of air volume sampled and weight PM of material on filter.
scottish government partisol monitoring programme 2007
Scottish Government Partisol Monitoring Programme 2007
  • PM10 and PM2.5 at 5 sites for 1 year
  • Data problems common to all UK Partisol measurements
  • High field blank due to moisture
  • Worst with Quartz filters – even though these are specified in EU PM10 standard
  • Data now corrected and reported
  • Data used for PM Mapping in Scotland
  • Changed to Emfab filters in AURN
bam beta attenuation monitor
BAM (Beta Attenuation Monitor)
  • Size-selected particulate matter on filter tape
  • Analysed by attenuation of Beta rays from Carbon-14 source
  • Zero from clean filter compared to soiled filter
  • Algorithm to calculate mass from attenuation
  • Correction factor may be required for equivalence
fdms operation issues
FDMS Operation Issues
  • Filter Changing
  • Possible long-term problems with FDMS C system
  • Use B or CB type drier
pm 10 monitoring in the scottish database
PM10 Monitoring in the Scottish Database
  • 45 monitors in total
  • FDMS 12
  • BAM 4
  • TEOM 29
conclusions
Conclusions
  • QA/QC work is key to everything
  • Audits and Ratification are a major part of the project work
  • PM - Partisol issues resolved
  • FDMS and BAM Equivalent PM analysers being deployed
  • We strive to support and work closely with LAs –
    • respond to requests and enquiries
    • offer advice
    • feedback if we see problems with the data
    • chase for calibrations
  • The database is building rapidly

2006 – ~20 sites

2007 – 44 sites

2008 – 60 sites

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