People across Dublin have reported a smoky smell and hazy skies, with weather experts saying the conditions are likely being caused by large wildfires burning in North Wales.
The haze was noticed across parts of the capital on Monday, prompting many people to question where the smoke was coming from.
Carlow Weather forecaster Alan O'Reilly said he had received several reports of the unusual conditions.
Responding to one person who suggested the smoke may have drifted across from Wales, he said: "Likely it is caused by the wildfires in Wales with that East to Northeast breeze."
The smoke is believed to have travelled across the Irish Sea from a major wildfire near Conwy Mountain and the Sychnant Pass in Conwy County, where firefighters have been battling the blaze since it broke out on Sunday.
Around 60 people were evacuated from their homes after police carried out door-to-door evacuations from as early as 6.30am.
North Wales Fire and Rescue Service said crews remain at the scene working in difficult conditions.
Incident Commander Jami Jennings said: "Due to the size and complexity of the incident, operations are expected to continue for some time."
He also urged people to stay away from the affected area to allow emergency services to continue their work safely.
The wildfire comes as much of England and Wales faces an increased risk of further blazes during the ongoing heatwave. Natural England has placed the South East, London and the Midlands at an "exceptional" wildfire risk, while the rest of England and Wales remains at a "very high" risk.
Wildfires have also continued to spread across parts of southern Spain, where soaring temperatures, strong winds and dry vegetation have forced thousands of residents and holidaymakers to evacuate.
Meanwhile, parts of Ireland remain under a Status Yellow high temperature warning, which includes a wildfire alert.
Emergency services in Crosshaven, Co Cork, successfully contained what was described as a significant gorse fire near Camden Fort after it broke out at around 5pm on Sunday.
The blaze spread rapidly in strong winds, with thick smoke visible as far away as Cobh and drifting across the harbour towards Carrigaline. At one stage, there were concerns the fire could spread towards nearby homes.
Fire crews from Crosshaven, Carrigaline, Kinsale and Cork City Fire Brigade responded alongside Cork County Fire Service, with support from the Coast Guard and the Port of Cork's firefighting tug, which used water cannons to help tackle the flames from the water.
Crews remained at the scene into the early hours of Monday to extinguish remaining hotspots and monitor for secondary fires.
The cause of the blaze has not yet been determined.
Authorities are continuing to urge the public to exercise extreme caution as hot, dry conditions persist. Vegetation across many parts of the country remains tinder dry, meaning even a small ignition source could quickly develop into a major wildfire.
