This picture shows the cloud of fumes seen belching from Ineos’ Grangemouth plant this afternoon, captured by a concerned Falkirk Herald reader.
She questioned whether the volume of pollution shown was normal, and posted a video on social media which clearly shows the extent of the emission.
The fumes have been pouring from two of the plant’s chimneys for at least an hour and a half.
It has been speculated the emission is a regular event used to burn off excess fuel, but that has not been confirmed.
Nobody was available at Ineos Grangemouth to answer our enquiry - we will provide more information as it becomes available.