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PM10 Levels in Ireland: Overall Average and Transboundary Contributions

This study explores the overall average PM10 levels in Ireland from 2002-2005, highlighting the lack of an east-west gradient. The analysis includes trends among different types of sites and the influence of wind direction. It also discusses the seasonal variation and contributing factors to high PM10 levels, such as meteorology, traffic volume, and home heating. The presence of sea salt as a major natural source and transboundary contributions to PM10 levels are also examined.

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PM10 Levels in Ireland: Overall Average and Transboundary Contributions

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  1. PM10 Ireland overall average 2002-2005 Overall PM10: 19 ug/m3 (median of means of sites) No east-west gradient apparent

  2. Annual averages • Trend between types • Broad range within one type

  3. Dependence on wind direction • Based on Dublin airport wind data • Two Cork sites • Two sites < 800 days • Other sites > 1180 days • Highest mean values for easterly wind directions • This indicates a transboundary contribution to PM10 levels during easterly wind conditions • This is consistent with Jennings et al.

  4. Seasonal variation • Similar levels in Cork and Dublin • Seasonal maxima in Feb/March/April • Contributing factors could include meteorology, traffic volume, home heating

  5. Sea Salt in PM10, 2005 • PM10 chemistry at three sites shows high seasalt contributions • Carnsore started May 2005 • SeaSalt is a major natural source in Ireland

  6. Trans-boundary:nss SO4 PM10 episodes 2005 • Elevated nss SO4 levels at three sites indicate regional rather than local source/event • These events in combination with elevated PM10 could indicate transboundary contribution to PM10 levels

  7. Thank you for your attention

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