Air pollution levels in some parts of the Central region have been the highest in the country today, as a combination of weather factors came together to create an unhealthy haze.
One of those factors was a storm in the Sahara desert thousands of miles away which has sent dust particles high into the atmosphere, which are now falling as sand and grit across the country.
It's been causing real problems for people with existing medical conditions, and those who have heart or lung problems are being urged to avoid strenuous activity. Chris Halpin reports.
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Fog patches and extensive low cloud at first will steadily lift and clear.
A murky start with mist and fog then gradually clearing, although some eastern coastal districts may remain cloudier.
Isolated showers should die out through the evening to leave a dry remainder of the night.