South Wales Fire Service are tackling a blaze at GLJ Recycling on the Newtown Industrial Estate, in Cross Keys, Caerphilly.
A spokesperson from the fire service said 700 tonnes of scrap metal and tyres are well alight.
4 pumps and a water bowser are in attendance at the scene.
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Low cloud will bring murky conditions with extensive hill fog.
The team, which is manned by volunteers, will operate out of Pontardawe Fire Station in partnership with Mid and West Wales Fire Service.
Dan Biggar has no doubt that Wales remain flrmly in the Six Nations title mix ahead of next Saturday's clash against Scotland.