Qa qc of scottish air quality data
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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


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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