"Think of the worst odour you can imagine and then add 10 percent," bus driver Göran Frick said of the man's smell to the local Upsala Nya Tidningen (UNT) newspaper.
"The stench is awful and has gotten worse."
According to drivers, the man smells so badly that passengers often ask to be let off the bus ahead of their stops when he steps on board
In a last ditch effort to deal with the offending odour, frustrated bus drivers signed a petition demanding that management at public transit operator UL take action.
"As drivers, we see this as a workplace problem and it's barely tolerable to work in such a stink," they wrote.
The drivers explained further that they had been forced to replace seats used by the man because the foul smelling odour stayed in the cushions so long after the man had travelled.
Public transit officials agreed that something "had to be done" and on Monday decided to visit the home of the man in an attempt to clear the air.
They explained that if the man didn't improve his personal hygiene he wouldn't be allowed to ride the bus.
According to UNT, the man understood that people had complained about his smell and public transit officials, who also sought assistance from the city to help the man, believe the situation will now resolve itself.
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"That our hope, anyway," UL spokesman Sture Jonsson told UNT.