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Zoning for Air Quality in Belgium: Methods and Zones

Explore the methodology, principles, and criteria used by the Flemish Environmental Agency to identify and classify air quality zones. Discover the zoning principles, key pollutant zones, and strategies for monitoring air quality in Belgium.

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Zoning for Air Quality in Belgium: Methods and Zones

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  1. Identifying and classifying zones and agglomerations Edward Roekens Flemish Environmental Agency

  2. Method of zonation 2004 • Methodology followed • Long time-series of measurement data for SO2, NOx, and Pb (from 1978) and for PM10 (from 1996) • Principals • To determine the agglomerations and zones with an important number of citizens: quantity in combination with population density 2

  3. Principles of zonation • Principals • Areas with similar air quality are grouped in 1 zone (e.g. 10 urban zones in Flanders with more than 50.000 inhabitants but less than 250.000) have the same ozone, NOx, and PM10 issues • Usually the zones are determined independent from the pollutant, but exceptions are possible (e.g. local influences of industrial activities: SO2 in Wezel • Present and future strategies of monitoring networkand derived design 3

  4. Air quality zones in Belgium

  5. Zonation SO2, NO2, PM10, Pb 5

  6. Zonation, 1st Daughter Directive All pollutant zones • Agglomeration Antwerp and Ghent >250 000 inhabitants • Cities > 50 000 inhabitants • Large industrial zones: Antwerp harbour, Ghent (canal zone) • Rest of Flanders 6

  7. Zonation, 1st Daughter Directive • One polluent zones • Lommel: SO2 non-ferrous • Beerse: Pb non-ferrous • Hoboken: Pb non-ferrous 7

  8. Zonation CO, benzene, ozone, PAHs All polluant zones • Agglomeration Antwerp an Ghent >250 000 inhabitants • Cities > 50 000 inhabitants • Big industrials zones: Antwerp harbour, Ghent (canal zone) • Rest of Flanders Or simplified zonation: see blue (BEF19S) 8

  9. Zonation heavy metals Zonation for Pb, As, Cd and Ni zones • Agglomeration Antwerp and Ghent >250 000 inhabitants • Large industrial zones: • Antwerp harbour: refineries • Ghent steel industry • Rest of Flanders Microzones • Hoboken: (Pb), As, Cd • Beerse: Pb, As, Cd • Genk: Ni, (Cd) 9

  10. Vegetation and natural ecosystem 20 km from agglomerations 5 km away from other important sources No such places in Flanders However critical levels SO2 20 µg/m³ NOx 30 µg/m³ Respected on sample sites of acid deposition network 10

  11. Supplementary methods of zonation • Models • Indicative measurements: e.g. passive samplers • Emission inventory • Expert knowledge 11

  12. Overview of the Belgian zones 12

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