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UK Air Quality Indicators

UK Air Quality Indicators . Janet Dixon Air and Environment Quality Division, Department of Environment, food and Rural Affairs, UK. Air quality monitoring network. UK Air Pollution Index. Used for providing a public summary of current and forecast air pollution

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UK Air Quality Indicators

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  1. UK Air Quality Indicators Janet Dixon Air and Environment Quality Division, Department of Environment, food and Rural Affairs, UK

  2. Air quality monitoring network

  3. UK Air Pollution Index • Used for providing a public summary of current and forecast air pollution • 1-10 scale in 4 bands for 5 pollutants - ozone, PM10, SO2, NO2, CO • Produced for all 16 UK zones and largest 16 of the 28 UK agglomerations • Levels reported = highest for any single pollutant • Has health advice associated with each band • Mainly driven by PM10 and O3 • Further information: www.airquality.co.uk/archive/standards.php#band

  4. UK Air Pollution Index

  5. UK Air Quality Headline Indicator • UK Sustainable Development Strategy • One of 15 headline indicators • Developed in 1998, reviewed in 2002 • Captures ‘acute’ air quality issues • Counts number of days of moderate or higher (from AP Index) pollution for 5 ‘acute’ pollutants – ozone, PM10, SO2, NO2, CO • Does not correspond directly to UK Air Quality Strategy objectives

  6. Headline indicator • Maximum number of sites used is fixed • Pre-1998 – up to 34 urban and 14 rural/remote • 1998 – 34 urban and 14 rural/remote • 2002 – 49 urban and 16 rural/remote • To be included sites need minimum range of pollutants and data capture (>75%) • Rural – at least O3 • Roadside/kerbside – at least PM10 • Other urban – at least O3, PM10 and SO2 • Fairly robust to changes in network • Urban sites cover 26 of the 28 UK agglomerations

  7. Final 2003 indicator Urban sites Rural sites

  8. Causes of air pollution at urban sites total urban

  9. Causes of air pollution at urban sites total urban particles sulphur dioxide

  10. Causes of air pollution at urban sites total urban ozone particles sulphur dioxide

  11. The main episodes driving 2003 • Exceptionally hot summer – • high ozone Rural • high secondary particulates(SO2 & NO2 gas converted to particulate sulphates & nitrates) Urban • Particulate episodes in spring, including • UK and European element • Saharan dust storm

  12. Indicator picks up peaks – what about long-term trends? PM10 NO2 SO2 but….

  13. ….for ozone:

  14. Conclusions • 2003 was an exceptional year. • Headline Indicator accurately reflects poor air quality in 2003 (but not every aspect). • Headline indicator is currently being reviewed For the future: • long-term trend downwards for most pollutants. • ozone increasing - global ozone precursor emissions, (?) global warming

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