Rugby Cement plant, UK, has announced that tyre-burning has started at its plant.
Just a few weeks ago, the Lawford Road plant was granted permission to burn shredded tyres as an alterntaive to fossil fuels.
And in the last few minutes, Cemex - who owns the plant - said tyre-buring has now begun.
The company is also looking to burn Climafuel, a mixture of household waste.
Campaigners have been fighting against tyre-burning, claiming the fumes are dangerous to the public - an argument Cemex strongly denies.