1. PM10 Ireland overall average 2002-2005
red
Traffic urban
yellow
Traffic suburban
green
Background suburban
blue
Industrial rural
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 ug/m3
Range of means
Median of means
Traffic urban
(n=12)
21.3
Traffic suburban
(n=15)
19.0
Industrial rural
(n=2)
16.7
Background suburban
(n=15)
15.5

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
ug/m3
mean ± std
median
Max
Malin Head
6.2 ± 5.5
4.9 29
Oak Park
1.8 ± 1.5
1.4
10.3
Carnsore Point
7.3 ± 6.2
5.5 38

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