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RCSI research finds air pollution in Ireland associated with strokes

By Dermot - 11th Aug 2020 | 5 views

20/04/2009 RCSI, St Stephen's Green, Dublin, Ireland ©Patrick Bolger

Scientists have found that air pollution in the winter is associated with more hospitalisations for all strokes in Dublin.

The study, led by researchers from RCSI University of Medicine and Health Sciences, is published in the current edition of Cerebrovascular Diseases.

During winter months in Ireland, particularly in Dublin, higher levels of fine particles, coarse particles, sulphur dioxide and nitrogen dioxide are found in the air. The sources of these are solid fuel burning, such as coal, peat, and wood, as well as road traffic – especially diesel engines.

After accounting for other variables, such as temperature, humidity, day of the week and time, the researchers found that there was a statistically significant rise in the number of hospitalisations for strokes in Dublin zero to two days after a rise in air pollution.

For higher levels of nitrogen dioxide and sulphur dioxide, the researchers found both had an associated 3.5% higher risk of stroke. Higher levels of coarse particles correlated with a 3.2% higher risk, and finer particles correlated with a 2.4% higher risk.

The study marks the first time there has been a link demonstrated between short-term air pollution and stroke in Ireland.

“Every year, more than 10,000 people in Ireland have a stroke. Our research adds evidence that there needs to be a national ban on solid fuel burning to help in our efforts to reduce this number,” said Dr Colm Byrne, the study’s lead author and clinical lecturer in the RCSI Department of Geriatric and Stroke Medicine.

There was no significant association for all air pollutants found in the smaller urban area of Cork, but meta-analysis showed a significant association between hospitalisations for strokes and higher levels nitrogen dioxide and fine particles in the air.

“Because Ireland has relatively low air pollution when compared internationally, this highlights the need to introduce additional policy changes to reduce air pollution in all countries,” said Professor David Williams, professor of stroke medicine at RCSI.

The research was carried out by researchers from RCSI (Dr Colm Byrne, Prof Kathleen Bennett, Prof Anne Hickey, and Prof. David Williams) in collaboration with Dr Paul Kavanagh from the Health Intelligence Unit in the HSE, and Prof. Brian Broderick and Prof. Margaret O’Mahony from the Department of Environmental Engineering at Trinity College Dublin.

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