Residents living near Fforestfach Industrial Estate in Swansea have been advised to keep their doors and windows closed after a large fire at a scrap yard.
Crews were called to the area just before 6am on Monday morning.
Over 70 firefighters are currently at the scene of the fire, which involves a large quantity of tyres, cylinders and scrap vehicles.
Mid and West Wales Fire and Rescue Service said a "multi-agency briefing" was held this morning with police, Swansea City Council, Natural Resources Wales and other agencies.
Public Health Wales has also advised people to stay away from the area.