Some bus passengers on Sunday were seen to be visibly affected by the smell upon entering the station.
Maths and physics student Tobias Cannon, 19, who had travelled to Leeds from Manchester to go to work, told the BBC the bus station “reeks”.
“I walked in and was like, oh my days,” he said.
“It’s like fish. I don’t know what that’s all about.”
Another passenger described the smell as “terrible”, adding: “It smells like there are cows in there.”
Meanwhile, passenger Has Samin, 32, said he was shocked at the odour when he got off a coach after having travelled from London to Leeds.
“It’s very bad, very bad,” he said.
“I was confused because I have never smelt anything like that.”