STOMPers are wondering whether companies here are 'intensifying' their waste disposal during this period of lower air quality.
Prof Benjamin Hill Detenber, from the School of Communication and Information in Nanyang Technological University (NTU), took this picture from the roof of his building on Oct 9.
"It took me a few minutes to get the camera, so I missed the biggest plume of flames and smoke," he said. Mr Detender thought it was 'ironic' that the refineries should be doing such a big blow-off during this hazy period.
Tan Chen Xing, who sent the following picture on Oct 11 taken from a Jurong flat, is also wondering if companies are "contributing to the haze by intensifying their own burning during this period."
STOMP is contacting the National Environmental Agency (NEA) for comment.