The fire started in the Glencullen area last night.
Locals in Lucan have been urged by Dublin Fire Brigade to close their windows and doors following a fire in the Dublin mountains.
The fire service responded to a gorse fire in the Glencullen area last night.
Smoke has now spread as far as Lucan, which has resulted in the fire service issuing the appeal on social media.
Two engines stayed overnight, and crews from Dun Laoghaire and Rathfarnham are in attendance today.

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